Selecting and Using Plant Growth Regulators on Floricultural Crops

Authors: Joyce G. Latimer, Extension Specialist, Greenhouse Crops; Virginia Tech

Publication Number 430-102, November 2001

Table 3. Labeled rates for plant growth regulators*. Unless otherwise stated, the treatment noted is intended to control plant height during production.

Crop Product Application Method & Rate Precautions & Remarks

Ageratum A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) Plug culture and flat culture differ in recommended rates. The rates shown in this table include both plug (lower rates) and flat culture (higher rates) recommendations. Apply all foliar sprays of plant growth regulators using 0.5 gallon per 100 square feet of bench area unless otherwise directed by the label. Cycocel rates may be increased to 3,000 ppm (3.25 fl oz/gal) after extensive testing.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal).

Sumagic 20 to 30 ppm spray (5.12 to 7.68 fl oz/gal)

Alternanthera (Joseph's-Coat) A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Alyssum Bonzi 10 to 60 ppm spray (0.32 to 1.92 fl oz/gal) See Ageratum.

Sumagic 5 to 25 ppm spray (1.3 to 6.4 fl oz/gal)

Amaryllis Bonzi 200 ppm drench for a 6 inch pot (6.4 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

100 ppm bulb soak (3.2 fl oz/gal) Soak bulbs for 1 hour.

Aster B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Azalea A-Rest 26 ppm spray (12.6 fl oz/gal)

Atrimmec 3,124 to 6,248 ppm spray (2 to 4 fl oz/gal) To increase lateral branching. Start treating rooted cuttings. May treat several times during first year of growth.

B-Nine 1,500 to 2,500 ppm spray (0.24 to 0.39 oz/gal) To promote flower initiation. Apply solution when new growth from final pinch is 1 to 2 inches long.

Bonzi 100 to 200 ppm spray (3.2 to 6.4 fl oz/gal) To control plant height and promote flower bud initiation, apply after final shaping, when new growth is 1.5 to 2 inches long. To reduce bypass shoot development, apply after bud set, when bypass shoots are barely visible.

5 to 15 ppm drench for a 6 inch pot (0.16 to 0.48 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Cycocel 1,000 to 4,000 ppm spray (1.08 to 4.34 fl oz/gal) To promote flower initiation. Optimum rates are generally between 1,000 and 2,000 ppm. Two to six multiple sprays may be needed. Apply first application when new growth is approximately 2 inches long.

Florel 2,500 to 5,000 ppm spray (8 to 16 fl oz/gal) To increase lateral branching. Apply at normal pinching times, up to 6-8 wk before bloom on finished plants or 2 wk before taking cuttings from stock plants.

GibGro 265 to 1,055 ppm spray (1.06 to 4.2 fl oz/gal). For partial or full substitution of cold. Spray timing, concentration, and number of applications vary with cultivar as well as intended degree of cold substitution. Consult the label for exact recommendations.

GibGro 130 to 850 ppm spray (0.52 to 3.4 fl oz/gal) To prevent flower bud initiation during vegetative growth. Apply two to three sprays at 2 to 3 week intervals after each pinch.

Off-Shoot-O Use a 3 to 5% spray solution (8.6 to 14 fl oz/gal) in greenhouses, use 5 to 7% (14 to 20 fl oz/gal;) outdoors. Apply as a foliar spray. To promote lateral shoot growth on vegetative plants. Efficacy is related to relative humidity and temperature. Spray a few plants to check activity prior treating the entire crop; effects should be visible in about 1 hour. Be certain chemical covers shoot tip. Ineffective if microscopic flower buds are present.

Sumagic 10 to 15 ppm spray (2.56 to 3.84 fl oz/gal) Apply at 1.5 quarts per 100 square feet of bench area at about 4 to 6 weeks after final pinch.

Bedding Plants
(Not specifically listed in this table) A-Rest 6 to 66 ppm spray (2.9 to 32 fl oz/gal). Use 15 ppm spray as a base rate and adjust as needed. See Ageratum.

1 to 2 ppm drench for a 4 inch pot (0.5 to 1 fl oz/gal of drench solution; apply 2 fl oz/4 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine + Cycocel 800 to 5,000 ppm B-Nine (0.13 to 0.79 oz/gal) + 1,000 to 1,500 ppm Cycocel (1.08 to 1.63 fl oz/gal) applied as a tank mix spray It is recommended to use the highest rate of Cycocel that does not cause excessive leaf yellowing, and then adjust the B-Nine rate up and down within the labeled range to attain desired level of height control.

Bonzi 5 to 90 ppm spray (0.16 to 2.88 fl oz/gal); recommended starting rate 30 ppm spray (0.96 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rates as needed for desired final plant height and duration of height control. Not recommended for use on fibrous begonia or vinca.

1 ppm drench for a 6 inch pot (0.03 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench applications are recommended only for bedding plants in 6 inch or larger containers. Not recommended for use on fibrous begonia or vinca.

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rates up to 3,000 ppm (3.25 fl oz/gal) as needed for desired final plant height and duration of height control.

Sumagic 1 to 50 ppm spray (0.26 to 12.7 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rates as needed for desired final plant height and duration of height control. Apply spray as elongation begins (plant height about 2 to 4 inches).

0.5 to 20 ppm spray to media surface (0.13 to 5.12 fl oz/gal)

0.1 to 2 ppm drench (0.03 to 0.51 fl oz/gal)

Bedding Plant Plugs
(Not specifically listed in this table) A-Rest 3 to 35 ppm spray (1.5 to 17 fl oz/gal); recommended starting range is 5 to 10 ppm spray (2.4 to 4.8 fl oz/gal) See Ageratum.

Drench plug flats with a 0.5 to 1 ppm solution (0.25 to 0.5 fl oz/gal) For uniform application, use a subirrigation delivery system. Plug trays should not be excessively dry prior to the subirrigation treatment. Begin application at 1 to 2 true leaf stage.

B-Nine 1,500 to 2,500 ppm spray (0.23 to 0.39 oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and duration of height control. Can be used at the beginning of the first true leaf stage through the finishing stage.

B-Nine + Cycocel 800 to 5,000 ppm B-Nine (0.13 to 0.79 oz/gal) + 1,000 to 1,500 ppm Cycocel (1.08 to 1.63 fl oz/gal) applied as a tank mix spray It is recommended to use the highest rate of Cycocel that does not cause excessive leaf yellowing, and then adjust the B-Nine rate up and down within the labeled range to attain desired level of height control.

Bonzi 1 to 20 ppm spray (0.03 to 0.64 fl oz/gal); recommended starting rate is 5 ppm spray (0.16 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and duration of height control. Plants should develop 1 to 2 true leaves prior to first application.

Cycocel 400 to 1,500 ppm spray (0.43 to 1.63 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rates as needed for desired final plant height and duration of height control.

Sumagic 0.5 to 10 ppm spray (0.13 to 2.6 fl oz/gal) to foliage or media surface Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and duration of height control. Plugs can be especially sensitive to Sumagic.

Begonia A-Rest 3 to 15 ppm spray (1.5 to 7.3 fl oz/gal) See Ageratum.

Atrimmec 781 to 1,562 ppm spray (0.5 to 1 fl oz/gal) Elatior begonias only - To increase lateral branching, treat unpinched plants with 2 to 3-inch long shoots 8 to 10 weeks before finishing for sale.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Florel 500 ppm spray (1.6 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation. See text for recommendations.

Bleeding Heart A-Rest 65 to 132 ppm spray ( 31.5 to 64 fl oz/gal) Higher rates may be phytotoxic.

Bougainvillea Atrimmec 1,562 ppm spray (1 fl oz/gal) To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.

Bromeliads Florel 2,500 ppm spray (8 fl oz/gal) To promote flower initiation.

Browallia B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Bulb Crops
(Not specifically listed in this table) A-Rest 25 to 50 ppm spray (12.1 to 24.2 fl oz/gal) Drenches are more effective than sprays on most bulb crops.

2 ppm drench for a 6 inch pot (l fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.

Bonzi 100 ppm spray (3.2 fl oz/gal)

10 ppm drench for a 6 inch pot (0.32 fl oz/gal of drench solution; apply 4 fl oz per 6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

20 ppm bulb soak (0.64 fl oz/gal) Soak for 15 minutes. Users should conduct trials on a small number of bulbs, adjusting the rate and soaking period (up to 1 hour) as needed for desired final plant height.

Sumagic 2.5 to 20 ppm spray (0.64 to 5.1 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control. Treat when shoots average 3 inches tall and again at 6 inches if necessary.

0.5 to 10 ppm spray to media surface (1.28 to 2.56 fl oz/gal)

1 to 3 ppm drench (0.26 to 0.77 fl oz/gal) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details. Application should be made when newly emerged shoots are 1 to 2 inches tall.

1 to 10 ppm bulb soak (0.26 to 2.6 fl oz/gal) Soak for 1 to 5 minutes. Users should conduct trials on a small number of bulbs, adjusting the rate and soaking period as needed for desired final plant height.

Caladium B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Bonzi 100 to 200 ppm spray (3.2 to 6.4 fl oz/gal) First spray applications should be made when plants are 2 to 4 inches tall.

2 to 16 ppm drench for a 6 inch pot (0.06 to 0.51 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) First drench applications should be made when plants are 1 to 2 inches tall. Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

60 ppm tuber soak (1.9 fl oz/gal) Soak tubers for 30 minutes prior to planting.

Calendula B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Calla Lily Bonzi 5 to 15 ppm drench for a 6 inch pot (0.16 to 0.48 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot See Caladium.

20 ppm rhizome/tuber soak (0.64 fl oz/gal) Soak the rhizomes/tubers for 15 minutes prior to planting.

Celosia A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Sumagic 10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)

Centaurea B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

China Aster A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)

Chrysanthemum, Cut B-Nine 2,500 ppm spray (0.39 oz/gal) To reduce "neck" stretching, spray upper foliage 5 weeks after start of short-day treatment.

Chrysanthemum, Potted A-Rest 25 to 50 ppm spray (12.1 to 24.2 fl oz/gal) Spray when axillary shoots following the pinch are 2.5 to 3 inches long.

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Apply when plants are 2 to 6 inches in height (about 2 weeks after pinch). Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 1,000 ppm preplant foliar dip (0.16 oz/gal) Rooted cuttings can be dipped in solution just to thoroughly wet leaves and stems and then potted. Allow foliage to dry before watering in. For unrooted cuttings, dip stems in solution, remove to a flat, cover to prevent dehydration and hold overnight under cool conditions. Stick the next day.

2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) Spray when new growth from pinch is 1 to 2 inches long. Some varieties may require another application 3 weeks later.

Bonzi 50 to 200 ppm spray (1.6 to 6.4 fl oz/gal)

1 to 4 ppm drench for a 6 inch pot (0.032 to 0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Sumagic 2.5 to 10 ppm spray (0.64 to 2.56 fl oz/gal) Apply when length of breaks is 1.5 to 2 inches (about 7 to 14 days after pinching).

5 to 10 ppm dip for unrooted cuttings (1.3 to 2.6 fl oz/gal) 2.5 ppm dip for rooted cuttings (0.64 fl oz/gal) Improves color and overall appearance. Follow dips with foliar sprays in lower rate range.

Chrysanthemum, Garden Florel 500 ppm spray (1.62 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.

Sumagic 2.5 to 10 ppm spray (0.64 to 2.56 fl oz/gal)

Clematis A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Cleome A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Coleus B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Bonzi 5 to 30 ppm spray (0.16 to 0.96 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Sumagic 10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)

Columbine** A-Rest 65 to 132 ppm spray (31.5 to 64 fl oz/gal See Ageratum. Apply when plants are well-rooted but prior to initiation of flowers.

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Coneflower** Sumagic 30 to 40 ppm spray (7.68 to 10.2 fl oz/gal)

Cornflower** (Centaurea) A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Cosmos B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Crossandra B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Daffodil Bonzi 20 to 40 ppm drench for a 6 inch pot (0.64 to 1.28 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) See Caladium.

80 ppm bulb soak (2.56 fl oz/gal) Soak bulbs for 1 hour prior to planting.

Florel 2,000 ppm spray (6.47 fl oz/gal) Reduces plant height and stem topple during flowering. Apply when shoots are 3-4 inches tall. See label for cultivar differences in rates.

Dahlia, Bedding Plant A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Sumagic 10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)

Dahlia, Tuberous A-Rest 2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Bonzi 10 to 40 ppm drench for a 6 inch pot (0.32 to 1.28 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

Greater than 40 ppm tuber soak (1.28 fl oz/gal) Soak tubers for 20 minutes prior to planting.

Delphinum** A-Rest 35 to 132 ppm spray (17 to 64 fl oz/gal) See Ageratum. Apply when plants are well-rooted but prior to initiation of flowering.

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Bonzi 30 to 60 ppm spray (0.96 to 1.92 fl oz/gal)

Dianthus A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 10 to 60 ppm spray (0.32 to 1.92 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Dracaena A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Dusty Miller B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Sumagic 30 ppm spray (7.7 fl oz/gal)

Easter Lily A-Rest 30 to 132 ppm spray (14.5 to 64 fl oz/gal); 50 ppm (24.2 fl oz/gal) is most common rate Apply when newly developing shoots are 2 to 3 inches in length; a second application when shoots average 6 inches in length may be needed.

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Single drench should be applied when shoots average 3 to 5 inches in length. Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Sumagic 3 to 15 ppm spray (0.8 to 3.8 fl oz/gal) Apply when shoots average 3 inches tall.

0.25 to 0.5 ppm drench for a 6 inch pot (0.065 to 0.13 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Exacum B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Fatshedera A-Rest 65 to 132 ppm spray (31.5 to 64 fl oz/gal) Apply when plants are well-rooted and actively growing.

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Atrimmec 1,171 to 1,562 ppm spray (0.75 to 1 fl oz/gal) To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.

Flowering/Foliage Plants, Herbaceous Species
(Not specifically listed in this table) A-Rest 20 to 50 ppm spray (9.7 to 24.2 fl oz/gal) Recommended starting rate for an A-Rest spray on a new herbaceous flowering or foliage species is 33 ppm (16 fl oz/gal).

1 to 2 ppm drench for a 6 inch pot (0.5 to 1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Bonzi 30 ppm spray (0.96 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.

1 ppm drench for a 6 inch pot (0.032 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Cycocel 800 to 3000 ppm spray (0.87 to 3.25 fl oz/gal); suggested initial rate for small-scale trials is 1,250 ppm (1.36 fl oz/gal) Optimum rate depends on species, desired amount of height control, and environmental conditions. Example herbaceous species known to respond to Cycocel are Achimenes, Aster, Astilbe, Begonia (hiemalis), Begonia (tuberous), Calceolaria, Carnation, Chrysanthemum, Columbine, Easter lily, Gynura aurantiaca, Ivy, Kalanchoe, Lilium spp., Morning glory, Pachystachys, Pilea spp., Pentas, Salvia spp., Schefflera, Sedum spp., and Sunflower.

2,000 to 4,000 ppm drench (2.17 to 4.34 fl oz/gal) Drench volumes vary with pot size. See label for recommended volumes. Herbaceous species known to respond to Cycocel are listed above.

Sumagic 5 to 40 ppm spray (1.28 to 10.2 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.

0.5 to 10 ppm spray to media surface (0.13 to 2.56 fl oz/gal)

0.1 to 1 ppm drench (0.026 to 0.26 fl oz/gal) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Flowering/Foliage Plants, Woody Species
(Not specifically listed in this table) A-Rest 50 ppm spray (24.2 fl oz/gal)

2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal) Two or more applications may be necessary if new growth begins to stretch or for enhanced coloration.

Bonzi 50 ppm spray (1.6 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.

2 ppm drench for a 6 inch pot (0.064 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Cycocel 800 to 3,000 ppm spray (0.87 to 3.25 fl oz/gal), suggested initial rate for small-scale trials is 1,250 ppm. Optimum rate depends on species, desired amount of height control, and environmental conditions. Example woody species known to respond to Cycocel are Baleria cristata, Bougainvillea, Camellia, Gardenia, Fuchsia, Hollies, Hydrangea, Lantana, Pseuderanthemum lactifolia, Rhododendron, and Roses (potted).

2,000 to 4,000 ppm drench (2.17 to 4.34 fl oz/gal of drench solution, apply 4 fl oz/6 inch pot) Drench volumes vary with pot size. See label for recommended volumes. Woody species known to respond to Cycocel are listed above.

Sumagic 20 to 50 ppm spray (5.1 to 12.7 fl oz/gal) Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.

1.5 to 20 ppm spray to media surface (0.38 to 5.1 fl oz/gal)

0.5 to 2 ppm drench (0.13 to 0.52 fl oz/gal of drench solution, apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Freesia Bonzi 2 to 4 ppm drench (0.06 to 0.13 fl oz/gal of drench solution, apply 4 fl oz/6 inch pot) To increase lateral branching. Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details

100 to 300 ppm corm soak (3.2 to 9.6 fl oz/gal) Soak corms in the solution for 1 hour before planting.

Fuchsia Atrimmec 781 to 2,343 ppm spray (0.5 to 1.5 fl oz/gal) To increase lateral branching. Treat rooted cuttings with 2 to 3 pairs of leaves or as soon as branching becomes desirable, but not later than 10 to 12 weeks before finishing for sale.

Florel 500 ppm spray (1.62 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.

Gardenia A-Rest 50 ppm spray (24.2 fl oz/gal)

2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Atrimmec 2,343 to 4,686 ppm (1.5 to 3 fl oz/gal) To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.

B-Nine 5,000 ppm spray (0.79 oz/gal) Spray when plants are at two-thirds final marketing size.

Geranium (Pelargonium) A-Rest 26 to 66 ppm spray (12.6 to 32 fl oz/gal) See Ageratum. Not effective on finished plants.

Atrimmec 1,562 ppm spray (1 fl oz/gal) To increase lateral branching. Labeled for ivy geraniums only. Avoid treating plants under stress.

Bonzi 10 to 30 ppm spray (0.32 to 0.96 fl oz/gal) Apply to zonal geraniums when new growth is 1.5 to 2 inches long. Apply to seed geraniums approximately 2 to 4 weeks after transplanting.

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal) on zonal and ivy geraniums First application should be made 2 to 4 weeks after planting plugs or rooted cuttings (after stems have started elongating). Multiple applications may be needed.

Cycocel 1,500 ppm spray (1.63 fl oz/gal) on seed geraniums. To promote earlier flowering in seed geraniums. Make two applications at 35 and 42 days after seeding. Treated plants should flower earlier, be more compact, and more well-branched than untreated plants.

Florel 300 to 500 ppm spray (1.0 to 1.62 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation. Use the lower concentration for ivy geraniums.

Sumagic 3 to 8 ppm spray (0.77 to 2.05 fl oz/gal) for cutting geraniums and 2 to 4 ppm spray (0.51 to 1.02 fl oz/gal) for seed geraniums See Ageratum.

Gerbera Daisy A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 1,200 to 5,000 ppm spray (0.18 to 0.79 oz/gal)

Gloxinia B-Nine 1,250 ppm spray (0.19 oz/gal) Phytotoxicity may occur at rates above 1,250 ppm.

Gomphrena B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Grape Ivy Atrimmec 781 to 1,562 ppm spray (0.5 to 1 fl oz/gal) To increase lateral branching.

Hibiscus** B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 30 to 150 ppm spray (0.96 to 4.8 fl oz/gal) Application should be made when laterals are 1 to 4 inches long. Single applications control lateral growth for 3 to 6 weeks.

Cycocel 200 to 600 ppm spray (0.22 to 0.65 fl oz/gal) Multiple applications starting prior to first pinch are recommended. Start with 460 ppm in trials.

Sumagic 10 ppm spray (2.6 fl oz/gal) Treat within 7 days of pruning. Multiple applications may be required.

Holly A-Rest 50 ppm spray (24.2 fl oz/gal)

2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Atrimmec 1,050 to 3,905 ppm spray (0.67 to 2.5 fl oz/gal) Avoid spraying Japanese holly just before or during flowering period if berry display is desired. To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.

Hollyhock** Bonzi 30 to 50 ppm spray (0.96 to 1.60 fl oz/gal)

Sumagic 5 to 40 ppm spray (1.3 to 10.2 fl oz/gal)

Hyacinth Florel 1,000 to 2,000 ppm spray (3.24 to 6.48 fl oz/gal) To reduce stem topple of potted hyacinths at time of full flower, apply foliar spray before florets have opened.

Hybrid Lily Bonzi 200 to 500 ppm spray (8.0 to 16.0 fl oz/gal) See Caladium.

4 to 30 ppm drench for a 6 inch pot (0.13 to 0.96 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

5 to 30 ppm bulb soak (0.16 to 0.96 fl oz/gal) Soak bulbs in the solution for 15 minutes prior to planting.

Sumagic 2.5 to 10 ppm spray (0.6 to 2.6 fl oz/gal)

1 to 10 ppm bulb soak (0.26 to 2.6 fl oz/gal) Soak bulbs in the solution for 1 to 5 minutes prior to planting.

Hydrangea A-Rest 50 ppm spray (24.2 fl oz/gal)

2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 5,000 to 7,500 ppm spray (0.79 to 1.18 oz/gal) Use lower rate in Spring when 4 to 5 pairs of leaves are visible and new growth is starting to unfold, but not later than 4 weeks after initiation of forcing. Use at higher rate for summer when regrowth after pinching is 1 to 2 inches long.

Hypoestes Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal) See Ageratum.

Impatiens A-Rest 10 to 44 ppm spray (4.8 to 21.3 fl oz/gal) See Ageratum.

Bonzi 0.5 to 45 ppm spray (0.02 to 1.44 fl oz/gal)

Sumagic 5 to 10 ppm spray (1.28 to 2.56 fl oz/gal)

Jerusalem Cherry Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal) See Ageratum.

Kalanchoe Atrimmec 1,042 to 2,343 ppm spray (0.67 to 1.5 fl oz/gal) To increase lateral branching, more compact growth with a greater number of inflorescences, treat 2 days after pinching main shoot..

B-Nine 1,200 to 5,000 ppm spray (0.18 to 0.79 oz/gal) Phytotoxicity possible if B-Nine accumulates in cupped areas of certain cupped-leafed varieties.

Lantana Atrimmec 781 to 1,562 ppm spray (0.5 to 1 fl oz/gal) To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.

Florel 500 ppm spray (1.62 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.

Liatris** A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6-inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Lipstick Vine Atrimmec 521 to 1,042 ppm spray (0.33 to 0.67 fl oz/gal) To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.

Lisianthus B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Marigold A-Rest 13 to 33 ppm spray (6.3 to 16 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 60 ppm spray (0.16 to 1.92 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Sumagic 10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)

Monarda** Bonzi 60 to 160 ppm spray (1.92 to 5.12 fl oz/gal)

Greater than 4 ppm drench for a 6 inch pot (0.13 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details

Sumagic 15 to 30 ppm spray (3.8 to 7.7 fl oz/gal)

Monstera A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Montbretia Bonzi 20 to 30 ppm corm soak (0.64 to 0.96 fl oz/gal) Soak corms in the solution for 15 minutes prior to planting.

Nasturtium Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Nepthytis, Green & Green Gold A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

New Guinea impatiens Bonzi 0.25 to 15 ppm spray (0.01 to 0.48 fl oz/gal)

Florel 300 ppm spray (1 fl oz/gal) To increase branching and reduce premature flowering. Do not apply within 8 weeks of desired flower date.

Ornamental Cabbage and Kale B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) Use the higher rates for more vigorous cultivars. Multiple applications may be needed.

Sumagic 2.5 to 8 ppm spray (0.6 to 2.1 fl oz/gal) Use the higher rates for more vigorous cultivars.

Ornamental Peppers Bonzi 20 ppm foliar spray (0.64 fl oz/gal)

Sumagic 5 to 15 ppm spray (1.3 to 3.8 fl oz/gal)

Ornamental Vegetables B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) Use the higher rates for more vigorous types / cultivars like 'Red Bor' Kale. Multiple applications may be needed.

Sumagic 10 to 25 ppm spray (2.6 to 6.4 fl oz/gal) Use the higher rates for more aggressive types / cultivars.

Pansy A-Rest 3 to 15 ppm spray (1.5 to 7.3 fl oz/gal) See Ageratum.

Bonzi 1 to 15 ppm spray (0.03 to 0.48 fl oz/gal)

Sumagic 1 to 6 ppm spray (0.26 to 1.54 fl oz/gal)

Petunia A-Rest 10 to 26 ppm spray (4.8 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)

Sumagic 25 to 50 ppm spray (6.4 to 12.8 fl oz/gal)

Philodendron A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)

Phlox** B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Pilea A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Poinsettia A-Rest 0.5 to 4 ppm drench for a 6 inch pot (0.25 to 1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volume and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 2,000 to 3,000 ppm spray (0.31 to 0.47 oz/gal) Not effective in NC State University studies.

B-Nine + Cycocel 800 to 2,500 ppm B-Nine (0.13 to 0.39 oz/gal) + 1,000 to 1,500 ppm Cycocel (1.08 to 1.63 fl oz/gal) spray Use the higher rates of this tank mix spray on stock plants and for finishing crops in very warm regions. Outside of very warm areas, growers should use the lower rates. Too late of an application can delay flowering and reduce bract size.

Bonzi 10 to 30 ppm spray (0.32 to 0.96 fl oz/gal)

0.25 to 3 ppm drench for a 6 inch pot (0.064 to 0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drenches generally have less of an effect on bract size than sprays. Drench volume and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal) For natural season crops in VA, do not apply Cycocel after mid-October. Late applications can reduce bract size and delay flowering.

3,000 to 4,000 ppm drench (3.25 to 4.34 fl oz/gal of drench solution) Drench volume and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Sumagic 2.5 to 10 ppm spray (0.64 to 2.56 fl oz/gal)

Portulaca A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

Sumagic 15 to 30 ppm spray (3.8 to 7.7 fl oz/gal)

Pothos A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

B-Nine 2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)

Purple coneflower** Sumagic 30 to 40 ppm spray (7.7 to 10.2 fl oz/gal)

Purple Passion (Gynura aurantiaca) A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Salvia** A-Rest 10 to 26 ppm spray (4.8 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 60 ppm spray (0.16 to 1.92 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Sumagic 5 to 10 ppm spray (1.28 to 2.56 fl oz/gal)

Schefflera A-Rest 25 to 132 ppm spray (12.1 to 64 fl oz/gal)

2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Atrimmec 3,124 ppm spray (2 fl oz/gal)

B-Nine 2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)

Shasta Daisy** Sumagic 15 to 30 ppm spray (3.8 to 7.7 fl oz/gal)

Snapdragon A-Rest 10 to 26 ppm spray (4.8 to 12.6 fl oz/gal) See Ageratum.

Bonzi 10 to 90 ppm spray (0.32 to 2.88 fl oz/gal)

Sumagic 25 to 50 ppm spray (6.4 to 12.8 fl oz/gal)

Spathiphyllum GibGro 265 ppm spray (1.06 fl oz/gal) To induce flowering; apply one full coverage spray during non-seasonal bloom period (June through January). Some cultivars exhibit distorted blooms, increased petiole length, and narrow leaves.

Speedwell** (Veronica) Bonzi 20 to 40 ppm spray (0.64 to 1.28 fl oz/gal)

Sumagic 20 to 40 ppm spray (5.1 to 10.2 fl oz/gal)

Sunflower Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Tulip A-Rest 1 to 4 ppm drench for a 6 inch pot (0.5 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Bonzi 5 to 40 ppm drench for a 6 inch pot (0.16 to 1.28 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

2 to 5 ppm bulb soak (0.064 to 0.16 fl oz/gal) Soak bulbs for 1 hour prior to planting.

Verbena**, bedding Atrimmec 521 to 1,042 ppm spray (0.33 to 0.67 fl oz/gal) To increase lateral branching. Treat unpinched seedlings or plants from cuttings 1 day after manual pinching.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal) See Ageratum.

Bonzi 5 to 30 ppm spray (0.16 to 0.96 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Florel 500 ppm spray (1.62 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.

Sumagic 15 to 30 ppm spray (3.84 to 7.68fl oz/gal)

Vinca (Catharanthus) A-Rest 5 to 18 ppm spray (2.4 to 8.7 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Sumagic 0.5 to 0.75 ppm spray to media surface (0.13 to 0.20 fl oz/gal)

Vinca Vine (Vinca spp.) Florel 500 ppm spray (1.62 fl oz/gal) To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.

Viola Sumagic 1 to 5 ppm spray (0.26 to 1.28 fl oz/gal) See Ageratum.

Wandering Jew A-Rest 26 to 132 ppm spray (12.6 to 64 fl oz/gal)

Woody Landscape Plants (Not specifically listed in this table) A-Rest 50 ppm spray (24.2 fl oz/gal)

2 ppm for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.

Bonzi 100 ppm spray (3.2 fl oz/gal). Users should conduct trials on a small number of plants, adjusting the rate to achieve desired height and length of control.

4 ppm drench for a 6 inch pot (0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot) Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details

Sumagic 10 to 50 ppm spray (2.56 to 12.8 fl oz/gal)

1 to 2 ppm drench (0.26 to 0.52 fl oz/gal)

Zinnia A-Rest 7 to 26 ppm spray (3.4 to 12.6 fl oz/gal) See Ageratum.

B-Nine 2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi 5 to 45 ppm spray (0.16 to 1.45 fl oz/gal)

Cycocel 800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

Crop	Product	Application Method & Rate	Precautions & Remarks
Ageratum	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	Plug culture and flat culture differ in recommended rates. The rates shown in this table include both plug (lower rates) and flat culture (higher rates) recommendations. Apply all foliar sprays of plant growth regulators using 0.5 gallon per 100 square feet of bench area unless otherwise directed by the label. Cycocel rates may be increased to 3,000 ppm (3.25 fl oz/gal) after extensive testing.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal).
Sumagic	20 to 30 ppm spray (5.12 to 7.68 fl oz/gal)
Alternanthera (Joseph's-Coat)	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Alyssum	Bonzi	10 to 60 ppm spray (0.32 to 1.92 fl oz/gal)	See Ageratum.
Sumagic	5 to 25 ppm spray (1.3 to 6.4 fl oz/gal)
Amaryllis	Bonzi	200 ppm drench for a 6 inch pot (6.4 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
100 ppm bulb soak (3.2 fl oz/gal)	Soak bulbs for 1 hour.
Aster	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Azalea	A-Rest	26 ppm spray (12.6 fl oz/gal)
Atrimmec	3,124 to 6,248 ppm spray (2 to 4 fl oz/gal)	To increase lateral branching. Start treating rooted cuttings. May treat several times during first year of growth.
B-Nine	1,500 to 2,500 ppm spray (0.24 to 0.39 oz/gal)	To promote flower initiation. Apply solution when new growth from final pinch is 1 to 2 inches long.
Bonzi	100 to 200 ppm spray (3.2 to 6.4 fl oz/gal)	To control plant height and promote flower bud initiation, apply after final shaping, when new growth is 1.5 to 2 inches long. To reduce bypass shoot development, apply after bud set, when bypass shoots are barely visible.
5 to 15 ppm drench for a 6 inch pot (0.16 to 0.48 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Cycocel	1,000 to 4,000 ppm spray (1.08 to 4.34 fl oz/gal)	To promote flower initiation. Optimum rates are generally between 1,000 and 2,000 ppm. Two to six multiple sprays may be needed. Apply first application when new growth is approximately 2 inches long.
Florel	2,500 to 5,000 ppm spray (8 to 16 fl oz/gal)	To increase lateral branching. Apply at normal pinching times, up to 6-8 wk before bloom on finished plants or 2 wk before taking cuttings from stock plants.
GibGro	265 to 1,055 ppm spray (1.06 to 4.2 fl oz/gal).	For partial or full substitution of cold. Spray timing, concentration, and number of applications vary with cultivar as well as intended degree of cold substitution. Consult the label for exact recommendations.
GibGro	130 to 850 ppm spray (0.52 to 3.4 fl oz/gal)	To prevent flower bud initiation during vegetative growth. Apply two to three sprays at 2 to 3 week intervals after each pinch.
Off-Shoot-O	Use a 3 to 5% spray solution (8.6 to 14 fl oz/gal) in greenhouses, use 5 to 7% (14 to 20 fl oz/gal;) outdoors. Apply as a foliar spray.	To promote lateral shoot growth on vegetative plants. Efficacy is related to relative humidity and temperature. Spray a few plants to check activity prior treating the entire crop; effects should be visible in about 1 hour. Be certain chemical covers shoot tip. Ineffective if microscopic flower buds are present.
Sumagic	10 to 15 ppm spray (2.56 to 3.84 fl oz/gal)	Apply at 1.5 quarts per 100 square feet of bench area at about 4 to 6 weeks after final pinch.
Bedding Plants (Not specifically listed in this table)	A-Rest	6 to 66 ppm spray (2.9 to 32 fl oz/gal). Use 15 ppm spray as a base rate and adjust as needed.	See Ageratum.
1 to 2 ppm drench for a 4 inch pot (0.5 to 1 fl oz/gal of drench solution; apply 2 fl oz/4 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine + Cycocel	800 to 5,000 ppm B-Nine (0.13 to 0.79 oz/gal) + 1,000 to 1,500 ppm Cycocel (1.08 to 1.63 fl oz/gal) applied as a tank mix spray	It is recommended to use the highest rate of Cycocel that does not cause excessive leaf yellowing, and then adjust the B-Nine rate up and down within the labeled range to attain desired level of height control.
Bonzi	5 to 90 ppm spray (0.16 to 2.88 fl oz/gal); recommended starting rate 30 ppm spray (0.96 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rates as needed for desired final plant height and duration of height control. Not recommended for use on fibrous begonia or vinca.
1 ppm drench for a 6 inch pot (0.03 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench applications are recommended only for bedding plants in 6 inch or larger containers. Not recommended for use on fibrous begonia or vinca.
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rates up to 3,000 ppm (3.25 fl oz/gal) as needed for desired final plant height and duration of height control.
Sumagic	1 to 50 ppm spray (0.26 to 12.7 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rates as needed for desired final plant height and duration of height control. Apply spray as elongation begins (plant height about 2 to 4 inches).
0.5 to 20 ppm spray to media surface (0.13 to 5.12 fl oz/gal)
0.1 to 2 ppm drench (0.03 to 0.51 fl oz/gal)
Bedding Plant Plugs (Not specifically listed in this table)	A-Rest	3 to 35 ppm spray (1.5 to 17 fl oz/gal); recommended starting range is 5 to 10 ppm spray (2.4 to 4.8 fl oz/gal)	See Ageratum.
Drench plug flats with a 0.5 to 1 ppm solution (0.25 to 0.5 fl oz/gal)	For uniform application, use a subirrigation delivery system. Plug trays should not be excessively dry prior to the subirrigation treatment. Begin application at 1 to 2 true leaf stage.
B-Nine	1,500 to 2,500 ppm spray (0.23 to 0.39 oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and duration of height control. Can be used at the beginning of the first true leaf stage through the finishing stage.
B-Nine + Cycocel	800 to 5,000 ppm B-Nine (0.13 to 0.79 oz/gal) + 1,000 to 1,500 ppm Cycocel (1.08 to 1.63 fl oz/gal) applied as a tank mix spray	It is recommended to use the highest rate of Cycocel that does not cause excessive leaf yellowing, and then adjust the B-Nine rate up and down within the labeled range to attain desired level of height control.
Bonzi	1 to 20 ppm spray (0.03 to 0.64 fl oz/gal); recommended starting rate is 5 ppm spray (0.16 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and duration of height control. Plants should develop 1 to 2 true leaves prior to first application.
Cycocel	400 to 1,500 ppm spray (0.43 to 1.63 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rates as needed for desired final plant height and duration of height control.
Sumagic	0.5 to 10 ppm spray (0.13 to 2.6 fl oz/gal) to foliage or media surface	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and duration of height control. Plugs can be especially sensitive to Sumagic.
Begonia	A-Rest	3 to 15 ppm spray (1.5 to 7.3 fl oz/gal)	See Ageratum.
Atrimmec	781 to 1,562 ppm spray (0.5 to 1 fl oz/gal)	Elatior begonias only - To increase lateral branching, treat unpinched plants with 2 to 3-inch long shoots 8 to 10 weeks before finishing for sale.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Florel	500 ppm spray (1.6 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation. See text for recommendations.
Bleeding Heart	A-Rest	65 to 132 ppm spray ( 31.5 to 64 fl oz/gal)	Higher rates may be phytotoxic.
Bougainvillea	Atrimmec	1,562 ppm spray (1 fl oz/gal)	To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.
Bromeliads	Florel	2,500 ppm spray (8 fl oz/gal)	To promote flower initiation.
Browallia	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Bulb Crops (Not specifically listed in this table)	A-Rest	25 to 50 ppm spray (12.1 to 24.2 fl oz/gal)	Drenches are more effective than sprays on most bulb crops.
2 ppm drench for a 6 inch pot (l fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.
Bonzi	100 ppm spray (3.2 fl oz/gal)
10 ppm drench for a 6 inch pot (0.32 fl oz/gal of drench solution; apply 4 fl oz per 6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
20 ppm bulb soak (0.64 fl oz/gal)	Soak for 15 minutes. Users should conduct trials on a small number of bulbs, adjusting the rate and soaking period (up to 1 hour) as needed for desired final plant height.
Sumagic	2.5 to 20 ppm spray (0.64 to 5.1 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control. Treat when shoots average 3 inches tall and again at 6 inches if necessary.
0.5 to 10 ppm spray to media surface (1.28 to 2.56 fl oz/gal)
1 to 3 ppm drench (0.26 to 0.77 fl oz/gal)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details. Application should be made when newly emerged shoots are 1 to 2 inches tall.
1 to 10 ppm bulb soak (0.26 to 2.6 fl oz/gal)	Soak for 1 to 5 minutes. Users should conduct trials on a small number of bulbs, adjusting the rate and soaking period as needed for desired final plant height.
Caladium	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Bonzi	100 to 200 ppm spray (3.2 to 6.4 fl oz/gal)	First spray applications should be made when plants are 2 to 4 inches tall.
2 to 16 ppm drench for a 6 inch pot (0.06 to 0.51 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	First drench applications should be made when plants are 1 to 2 inches tall. Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
60 ppm tuber soak (1.9 fl oz/gal)	Soak tubers for 30 minutes prior to planting.
Calendula	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Calla Lily	Bonzi	5 to 15 ppm drench for a 6 inch pot (0.16 to 0.48 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot	See Caladium.
20 ppm rhizome/tuber soak (0.64 fl oz/gal)	Soak the rhizomes/tubers for 15 minutes prior to planting.
Celosia	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Sumagic	10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)
Centaurea	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
China Aster	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)
Chrysanthemum, Cut	B-Nine	2,500 ppm spray (0.39 oz/gal)	To reduce "neck" stretching, spray upper foliage 5 weeks after start of short-day treatment.
Chrysanthemum, Potted	A-Rest	25 to 50 ppm spray (12.1 to 24.2 fl oz/gal)	Spray when axillary shoots following the pinch are 2.5 to 3 inches long.
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Apply when plants are 2 to 6 inches in height (about 2 weeks after pinch). Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	1,000 ppm preplant foliar dip (0.16 oz/gal)	Rooted cuttings can be dipped in solution just to thoroughly wet leaves and stems and then potted. Allow foliage to dry before watering in. For unrooted cuttings, dip stems in solution, remove to a flat, cover to prevent dehydration and hold overnight under cool conditions. Stick the next day.
2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	Spray when new growth from pinch is 1 to 2 inches long. Some varieties may require another application 3 weeks later.
Bonzi	50 to 200 ppm spray (1.6 to 6.4 fl oz/gal)
1 to 4 ppm drench for a 6 inch pot (0.032 to 0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Sumagic	2.5 to 10 ppm spray (0.64 to 2.56 fl oz/gal)	Apply when length of breaks is 1.5 to 2 inches (about 7 to 14 days after pinching).
5 to 10 ppm dip for unrooted cuttings (1.3 to 2.6 fl oz/gal) 2.5 ppm dip for rooted cuttings (0.64 fl oz/gal)	Improves color and overall appearance. Follow dips with foliar sprays in lower rate range.
Chrysanthemum, Garden	Florel	500 ppm spray (1.62 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.
Sumagic	2.5 to 10 ppm spray (0.64 to 2.56 fl oz/gal)
Clematis	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Cleome	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Coleus	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Bonzi	5 to 30 ppm spray (0.16 to 0.96 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Sumagic	10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)
Columbine**	A-Rest	65 to 132 ppm spray (31.5 to 64 fl oz/gal	See Ageratum. Apply when plants are well-rooted but prior to initiation of flowers.
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Coneflower**	Sumagic	30 to 40 ppm spray (7.68 to 10.2 fl oz/gal)
Cornflower** (Centaurea)	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Cosmos	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Crossandra	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Daffodil	Bonzi	20 to 40 ppm drench for a 6 inch pot (0.64 to 1.28 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	See Caladium.
80 ppm bulb soak (2.56 fl oz/gal)	Soak bulbs for 1 hour prior to planting.
Florel	2,000 ppm spray (6.47 fl oz/gal)	Reduces plant height and stem topple during flowering. Apply when shoots are 3-4 inches tall. See label for cultivar differences in rates.
Dahlia, Bedding Plant	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Sumagic	10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)
Dahlia, Tuberous	A-Rest	2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Bonzi	10 to 40 ppm drench for a 6 inch pot (0.32 to 1.28 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)
Greater than 40 ppm tuber soak (1.28 fl oz/gal)	Soak tubers for 20 minutes prior to planting.
Delphinum**	A-Rest	35 to 132 ppm spray (17 to 64 fl oz/gal)	See Ageratum. Apply when plants are well-rooted but prior to initiation of flowering.
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Bonzi	30 to 60 ppm spray (0.96 to 1.92 fl oz/gal)
Dianthus	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	10 to 60 ppm spray (0.32 to 1.92 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Dracaena	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Dusty Miller	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Sumagic	30 ppm spray (7.7 fl oz/gal)
Easter Lily	A-Rest	30 to 132 ppm spray (14.5 to 64 fl oz/gal); 50 ppm (24.2 fl oz/gal) is most common rate	Apply when newly developing shoots are 2 to 3 inches in length; a second application when shoots average 6 inches in length may be needed.
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Single drench should be applied when shoots average 3 to 5 inches in length. Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Sumagic	3 to 15 ppm spray (0.8 to 3.8 fl oz/gal)	Apply when shoots average 3 inches tall.
0.25 to 0.5 ppm drench for a 6 inch pot (0.065 to 0.13 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Exacum	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Fatshedera	A-Rest	65 to 132 ppm spray (31.5 to 64 fl oz/gal)	Apply when plants are well-rooted and actively growing.
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Atrimmec	1,171 to 1,562 ppm spray (0.75 to 1 fl oz/gal)	To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.
Flowering/Foliage Plants, Herbaceous Species (Not specifically listed in this table)	A-Rest	20 to 50 ppm spray (9.7 to 24.2 fl oz/gal)	Recommended starting rate for an A-Rest spray on a new herbaceous flowering or foliage species is 33 ppm (16 fl oz/gal).
1 to 2 ppm drench for a 6 inch pot (0.5 to 1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Bonzi	30 ppm spray (0.96 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.
1 ppm drench for a 6 inch pot (0.032 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Cycocel	800 to 3000 ppm spray (0.87 to 3.25 fl oz/gal); suggested initial rate for small-scale trials is 1,250 ppm (1.36 fl oz/gal)	Optimum rate depends on species, desired amount of height control, and environmental conditions. Example herbaceous species known to respond to Cycocel are Achimenes, Aster, Astilbe, Begonia (hiemalis), Begonia (tuberous), Calceolaria, Carnation, Chrysanthemum, Columbine, Easter lily, Gynura aurantiaca, Ivy, Kalanchoe, Lilium spp., Morning glory, Pachystachys, Pilea spp., Pentas, Salvia spp., Schefflera, Sedum spp., and Sunflower.
2,000 to 4,000 ppm drench (2.17 to 4.34 fl oz/gal)	Drench volumes vary with pot size. See label for recommended volumes. Herbaceous species known to respond to Cycocel are listed above.
Sumagic	5 to 40 ppm spray (1.28 to 10.2 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.
0.5 to 10 ppm spray to media surface (0.13 to 2.56 fl oz/gal)
0.1 to 1 ppm drench (0.026 to 0.26 fl oz/gal)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Flowering/Foliage Plants, Woody Species (Not specifically listed in this table)	A-Rest	50 ppm spray (24.2 fl oz/gal)
2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)	Two or more applications may be necessary if new growth begins to stretch or for enhanced coloration.
Bonzi	50 ppm spray (1.6 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.
2 ppm drench for a 6 inch pot (0.064 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Cycocel	800 to 3,000 ppm spray (0.87 to 3.25 fl oz/gal), suggested initial rate for small-scale trials is 1,250 ppm.	Optimum rate depends on species, desired amount of height control, and environmental conditions. Example woody species known to respond to Cycocel are Baleria cristata, Bougainvillea, Camellia, Gardenia, Fuchsia, Hollies, Hydrangea, Lantana, Pseuderanthemum lactifolia, Rhododendron, and Roses (potted).
2,000 to 4,000 ppm drench (2.17 to 4.34 fl oz/gal of drench solution, apply 4 fl oz/6 inch pot)	Drench volumes vary with pot size. See label for recommended volumes. Woody species known to respond to Cycocel are listed above.
Sumagic	20 to 50 ppm spray (5.1 to 12.7 fl oz/gal)	Users should conduct trials on a small number of plants, adjusting the rate as needed for desired final plant height and length of height control.
1.5 to 20 ppm spray to media surface (0.38 to 5.1 fl oz/gal)
0.5 to 2 ppm drench (0.13 to 0.52 fl oz/gal of drench solution, apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Freesia	Bonzi	2 to 4 ppm drench (0.06 to 0.13 fl oz/gal of drench solution, apply 4 fl oz/6 inch pot)	To increase lateral branching. Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details
100 to 300 ppm corm soak (3.2 to 9.6 fl oz/gal)	Soak corms in the solution for 1 hour before planting.
Fuchsia	Atrimmec	781 to 2,343 ppm spray (0.5 to 1.5 fl oz/gal)	To increase lateral branching. Treat rooted cuttings with 2 to 3 pairs of leaves or as soon as branching becomes desirable, but not later than 10 to 12 weeks before finishing for sale.
Florel	500 ppm spray (1.62 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.
Gardenia	A-Rest	50 ppm spray (24.2 fl oz/gal)
2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Atrimmec	2,343 to 4,686 ppm (1.5 to 3 fl oz/gal)	To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.
B-Nine	5,000 ppm spray (0.79 oz/gal)	Spray when plants are at two-thirds final marketing size.
Geranium (Pelargonium)	A-Rest	26 to 66 ppm spray (12.6 to 32 fl oz/gal)	See Ageratum. Not effective on finished plants.
Atrimmec	1,562 ppm spray (1 fl oz/gal)	To increase lateral branching. Labeled for ivy geraniums only. Avoid treating plants under stress.
Bonzi	10 to 30 ppm spray (0.32 to 0.96 fl oz/gal)	Apply to zonal geraniums when new growth is 1.5 to 2 inches long. Apply to seed geraniums approximately 2 to 4 weeks after transplanting.
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal) on zonal and ivy geraniums	First application should be made 2 to 4 weeks after planting plugs or rooted cuttings (after stems have started elongating). Multiple applications may be needed.
Cycocel	1,500 ppm spray (1.63 fl oz/gal) on seed geraniums.	To promote earlier flowering in seed geraniums. Make two applications at 35 and 42 days after seeding. Treated plants should flower earlier, be more compact, and more well-branched than untreated plants.
Florel	300 to 500 ppm spray (1.0 to 1.62 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation. Use the lower concentration for ivy geraniums.
Sumagic	3 to 8 ppm spray (0.77 to 2.05 fl oz/gal) for cutting geraniums and 2 to 4 ppm spray (0.51 to 1.02 fl oz/gal) for seed geraniums	See Ageratum.
Gerbera Daisy	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	1,200 to 5,000 ppm spray (0.18 to 0.79 oz/gal)
Gloxinia	B-Nine	1,250 ppm spray (0.19 oz/gal)	Phytotoxicity may occur at rates above 1,250 ppm.
Gomphrena	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Grape Ivy	Atrimmec	781 to 1,562 ppm spray (0.5 to 1 fl oz/gal)	To increase lateral branching.
Hibiscus**	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	30 to 150 ppm spray (0.96 to 4.8 fl oz/gal)	Application should be made when laterals are 1 to 4 inches long. Single applications control lateral growth for 3 to 6 weeks.
Cycocel	200 to 600 ppm spray (0.22 to 0.65 fl oz/gal)	Multiple applications starting prior to first pinch are recommended. Start with 460 ppm in trials.
Sumagic	10 ppm spray (2.6 fl oz/gal)	Treat within 7 days of pruning. Multiple applications may be required.
Holly	A-Rest	50 ppm spray (24.2 fl oz/gal)
2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Atrimmec	1,050 to 3,905 ppm spray (0.67 to 2.5 fl oz/gal)	Avoid spraying Japanese holly just before or during flowering period if berry display is desired. To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.
Hollyhock**	Bonzi	30 to 50 ppm spray (0.96 to 1.60 fl oz/gal)
Sumagic	5 to 40 ppm spray (1.3 to 10.2 fl oz/gal)
Hyacinth	Florel	1,000 to 2,000 ppm spray (3.24 to 6.48 fl oz/gal)	To reduce stem topple of potted hyacinths at time of full flower, apply foliar spray before florets have opened.
Hybrid Lily	Bonzi	200 to 500 ppm spray (8.0 to 16.0 fl oz/gal)	See Caladium.
4 to 30 ppm drench for a 6 inch pot (0.13 to 0.96 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)
5 to 30 ppm bulb soak (0.16 to 0.96 fl oz/gal)	Soak bulbs in the solution for 15 minutes prior to planting.
Sumagic	2.5 to 10 ppm spray (0.6 to 2.6 fl oz/gal)
1 to 10 ppm bulb soak (0.26 to 2.6 fl oz/gal)	Soak bulbs in the solution for 1 to 5 minutes prior to planting.
Hydrangea	A-Rest	50 ppm spray (24.2 fl oz/gal)
2 ppm drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	5,000 to 7,500 ppm spray (0.79 to 1.18 oz/gal)	Use lower rate in Spring when 4 to 5 pairs of leaves are visible and new growth is starting to unfold, but not later than 4 weeks after initiation of forcing. Use at higher rate for summer when regrowth after pinching is 1 to 2 inches long.
Hypoestes	Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)	See Ageratum.
Impatiens	A-Rest	10 to 44 ppm spray (4.8 to 21.3 fl oz/gal)	See Ageratum.
Bonzi	0.5 to 45 ppm spray (0.02 to 1.44 fl oz/gal)
Sumagic	5 to 10 ppm spray (1.28 to 2.56 fl oz/gal)
Jerusalem Cherry	Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)	See Ageratum.
Kalanchoe	Atrimmec	1,042 to 2,343 ppm spray (0.67 to 1.5 fl oz/gal)	To increase lateral branching, more compact growth with a greater number of inflorescences, treat 2 days after pinching main shoot..
B-Nine	1,200 to 5,000 ppm spray (0.18 to 0.79 oz/gal)	Phytotoxicity possible if B-Nine accumulates in cupped areas of certain cupped-leafed varieties.
Lantana	Atrimmec	781 to 1,562 ppm spray (0.5 to 1 fl oz/gal)	To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.
Florel	500 ppm spray (1.62 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.
Liatris**	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6-inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Lipstick Vine	Atrimmec	521 to 1,042 ppm spray (0.33 to 0.67 fl oz/gal)	To increase lateral branching. Sprays should be applied to unpinched shoots when they reach 3 inches or to pruned plants 3 days after pruning. Avoid treating plants under stress.
Lisianthus	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Marigold	A-Rest	13 to 33 ppm spray (6.3 to 16 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 60 ppm spray (0.16 to 1.92 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Sumagic	10 to 20 ppm spray (2.56 to 5.12 fl oz/gal)
Monarda**	Bonzi	60 to 160 ppm spray (1.92 to 5.12 fl oz/gal)
Greater than 4 ppm drench for a 6 inch pot (0.13 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details
Sumagic	15 to 30 ppm spray (3.8 to 7.7 fl oz/gal)
Monstera	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Montbretia	Bonzi	20 to 30 ppm corm soak (0.64 to 0.96 fl oz/gal)	Soak corms in the solution for 15 minutes prior to planting.
Nasturtium	Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Nepthytis, Green & Green Gold	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
New Guinea impatiens	Bonzi	0.25 to 15 ppm spray (0.01 to 0.48 fl oz/gal)
Florel	300 ppm spray (1 fl oz/gal)	To increase branching and reduce premature flowering. Do not apply within 8 weeks of desired flower date.
Ornamental Cabbage and Kale	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	Use the higher rates for more vigorous cultivars. Multiple applications may be needed.
Sumagic	2.5 to 8 ppm spray (0.6 to 2.1 fl oz/gal)	Use the higher rates for more vigorous cultivars.
Ornamental Peppers	Bonzi	20 ppm foliar spray (0.64 fl oz/gal)
Sumagic	5 to 15 ppm spray (1.3 to 3.8 fl oz/gal)
Ornamental Vegetables	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	Use the higher rates for more vigorous types / cultivars like 'Red Bor' Kale. Multiple applications may be needed.
Sumagic	10 to 25 ppm spray (2.6 to 6.4 fl oz/gal)	Use the higher rates for more aggressive types / cultivars.
Pansy	A-Rest	3 to 15 ppm spray (1.5 to 7.3 fl oz/gal)	See Ageratum.
Bonzi	1 to 15 ppm spray (0.03 to 0.48 fl oz/gal)
Sumagic	1 to 6 ppm spray (0.26 to 1.54 fl oz/gal)
Petunia	A-Rest	10 to 26 ppm spray (4.8 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 45 ppm spray (0.16 to 1.44 fl oz/gal)
Sumagic	25 to 50 ppm spray (6.4 to 12.8 fl oz/gal)
Philodendron	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)
Phlox**	B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Pilea	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Poinsettia	A-Rest	0.5 to 4 ppm drench for a 6 inch pot (0.25 to 1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volume and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	2,000 to 3,000 ppm spray (0.31 to 0.47 oz/gal)	Not effective in NC State University studies.
B-Nine + Cycocel	800 to 2,500 ppm B-Nine (0.13 to 0.39 oz/gal) + 1,000 to 1,500 ppm Cycocel (1.08 to 1.63 fl oz/gal) spray	Use the higher rates of this tank mix spray on stock plants and for finishing crops in very warm regions. Outside of very warm areas, growers should use the lower rates. Too late of an application can delay flowering and reduce bract size.
Bonzi	10 to 30 ppm spray (0.32 to 0.96 fl oz/gal)
0.25 to 3 ppm drench for a 6 inch pot (0.064 to 0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drenches generally have less of an effect on bract size than sprays. Drench volume and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)	For natural season crops in VA, do not apply Cycocel after mid-October. Late applications can reduce bract size and delay flowering.
3,000 to 4,000 ppm drench (3.25 to 4.34 fl oz/gal of drench solution)	Drench volume and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Sumagic	2.5 to 10 ppm spray (0.64 to 2.56 fl oz/gal)
Portulaca	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
Sumagic	15 to 30 ppm spray (3.8 to 7.7 fl oz/gal)
Pothos	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
B-Nine	2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)
Purple coneflower**	Sumagic	30 to 40 ppm spray (7.7 to 10.2 fl oz/gal)
Purple Passion (Gynura aurantiaca)	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Salvia**	A-Rest	10 to 26 ppm spray (4.8 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 60 ppm spray (0.16 to 1.92 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Sumagic	5 to 10 ppm spray (1.28 to 2.56 fl oz/gal)
Schefflera	A-Rest	25 to 132 ppm spray (12.1 to 64 fl oz/gal)
2 to 4 ppm drench for a 6 inch pot (1 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Atrimmec	3,124 ppm spray (2 fl oz/gal)
B-Nine	2,500 to 7,500 ppm spray (0.39 to 1.18 oz/gal)
Shasta Daisy**	Sumagic	15 to 30 ppm spray (3.8 to 7.7 fl oz/gal)
Snapdragon	A-Rest	10 to 26 ppm spray (4.8 to 12.6 fl oz/gal)	See Ageratum.
Bonzi	10 to 90 ppm spray (0.32 to 2.88 fl oz/gal)
Sumagic	25 to 50 ppm spray (6.4 to 12.8 fl oz/gal)
Spathiphyllum	GibGro	265 ppm spray (1.06 fl oz/gal)	To induce flowering; apply one full coverage spray during non-seasonal bloom period (June through January). Some cultivars exhibit distorted blooms, increased petiole length, and narrow leaves.
Speedwell** (Veronica)	Bonzi	20 to 40 ppm spray (0.64 to 1.28 fl oz/gal)
Sumagic	20 to 40 ppm spray (5.1 to 10.2 fl oz/gal)
Sunflower	Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Tulip	A-Rest	1 to 4 ppm drench for a 6 inch pot (0.5 to 2 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Bonzi	5 to 40 ppm drench for a 6 inch pot (0.16 to 1.28 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
2 to 5 ppm bulb soak (0.064 to 0.16 fl oz/gal)	Soak bulbs for 1 hour prior to planting.
Verbena**, bedding	Atrimmec	521 to 1,042 ppm spray (0.33 to 0.67 fl oz/gal)	To increase lateral branching. Treat unpinched seedlings or plants from cuttings 1 day after manual pinching.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)	See Ageratum.
Bonzi	5 to 30 ppm spray (0.16 to 0.96 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Florel	500 ppm spray (1.62 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.
Sumagic	15 to 30 ppm spray (3.84 to 7.68fl oz/gal)
Vinca (Catharanthus)	A-Rest	5 to 18 ppm spray (2.4 to 8.7 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)
Sumagic	0.5 to 0.75 ppm spray to media surface (0.13 to 0.20 fl oz/gal)
Vinca Vine (Vinca spp.)	Florel	500 ppm spray (1.62 fl oz/gal)	To increase lateral branching, prevent flower initiation and development, and inhibit internode elongation.
Viola	Sumagic	1 to 5 ppm spray (0.26 to 1.28 fl oz/gal)	See Ageratum.
Wandering Jew	A-Rest	26 to 132 ppm spray (12.6 to 64 fl oz/gal)
Woody Landscape Plants (Not specifically listed in this table)	A-Rest	50 ppm spray (24.2 fl oz/gal)
2 ppm for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details.
Bonzi	100 ppm spray (3.2 fl oz/gal).	Users should conduct trials on a small number of plants, adjusting the rate to achieve desired height and length of control.
4 ppm drench for a 6 inch pot (0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)	Drench volumes and mg a.i. vary with pot size. See text for discussion of drench applications. See label for details
Sumagic	10 to 50 ppm spray (2.56 to 12.8 fl oz/gal)
1 to 2 ppm drench (0.26 to 0.52 fl oz/gal)
Zinnia	A-Rest	7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)	See Ageratum.
B-Nine	2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)
Bonzi	5 to 45 ppm spray (0.16 to 1.45 fl oz/gal)
Cycocel	800 to 1,500 ppm spray (0.87 to 1.63 fl oz/gal)

*Adapted and updated from D. Bailey and B. Whipker. 1998. Height Control of Commercial Greenhouse Flowers. NC Coop. Ext. Serv. Horticulture Information Leaflet 528 and D. Bailey and B. Whipker. 1998. Best Management Practices for Plant Growth Regulators Used in Floriculture. NC Coop Ext. Serv. Horticulture Information Leaflet 529.

**For additional information on perennial species, see "Using Plant Growth Regulators on Containerized Herbaceous Perennials" by J.G. Latimer, H.L. Scoggins, and T.J. Banko. Va Coop Ext Pub #430-103

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