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A-rest* Back
Specific Species and Application rates
Suggested Rates on Bedding Plants & Plugs
Suggested Trial Rates on Perennials
Bulb Crops
Holiday and Other Flowering Pot Crops
Poinsettia

Suggested Rates on Bedding Plants & Plugs

The amount of A-Rest* required for an optimum growth response depends upon pot size, stage of growth, method of application, season and varietal response.

Species-specific cultural practices such as watering, potting media, fertilization and temperature will also affect the growth response to a given dosage. Therefore, you should establish specific application rates based on small-scale treatments under actual use conditions and keep records as to plant species and variety sensitivity. Generally, growers in northern, cooler climates will use rates at the lower end of the range, while growers in warmer, southern climates use rates at the upper end of the ranges listed.

Sprenching Plugs: The sprench technique refers to applying at least 1 gallon of spray solution to 100 square feet, or double a normal spray application volume. The method is intended to place spray solution into the top of the soil media where the root will absorb the active ingredient once emerged. This method allows for early growth control with ease of application and less variation in rates. This treatment should provide growth control for up to two weeks at the correct rate. Fertilizer should not be held back for growth control when using the sprench application. Reapplication may be made when plants are no longer showing growth control.

Ageratum On plugs: 2 - 6 ppm sprench at radicle emergence, 3-7 ppm spray after true leaves have emerged
After transplanting: 8-15 ppm spray (7-10 days after transplanting)
Alyssum On plugs: 6 -10 ppm sprench at radicle emergence, 8-16 ppm spray (begin applying when plugs are at full stand)
After transplanting: Not recommended
Aster On plugs: 6 -10 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 15-26 ppm spray (7-10 days after transplanting)
Begonia On plugs (if needed): 3-5 ppm spray (as needed)
After transplanting: 6-16 ppm spray (1-2 weeks after transplanting)
On hanging baskets: 1/2 - 1 ppm drench (after a good root system has developed after final transplanting)
Celosia On plugs: 6 - 10 ppm sprench at radicle emergence, 5 -10 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 10-15 ppm spray (7-10 days after transplanting)
Cleome On plugs: 6 - 10 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 15-26 ppm spray (7-10 days after transplanting)
Coleus On plugs: 6 - 10 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 12-20 ppm spray (apply when needed to check growth)
Cosmos On plugs: 6 - 10 ppm sprench at seeding, 10 - 25 ppm spray (after appearance of 1-2 true leaves)
After transplanting: Not recommended
Dahlia (seed) On plugs: 2 - 6 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 2-3 true leaves)
Before transplanting: 10-15 ppm spray (one week before transplanting)
After transplanting: 12-24 ppm spray (7-10 days after transplanting) or 1-3 ppm drench on pots or baskets
Bedding Plants (holding): 15-26 ppm spray or 2-4 ppm drench
Dianthus On plugs: 6 - 10 ppm sprench at radicle emergence, 10-15 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 15-26 ppm spray (7-10 days after transplanting)
Dusty Miller On plugs: 6 - 10 ppm sprench at radicle emergence, 5-10 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 7-12 ppm spray (7-10 days after transplanting)
Geranium On plugs: 6 - 10 ppm sprench at radicle emergence, 26-35 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 33-66 ppm spray (3-7 days after transplanting)
Impatiens On plugs: 6 - 10 ppm sprench at radicle emergence, 10-20 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 20-33 ppm spray (5-7 days after transplanting) or 2-4 ppm drench
Lobelia On plugs: 2 - 6 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 10-15 ppm spray (7-10 days after transplanting)
Marigold On plugs: 6 - 10 ppm sprench at radicle emergence, 13-20 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 18-26 ppm spray (5-7 days after transplanting)
Pansy On plugs: 2 - 6 ppm sprench at radicle emergence, 3-7 ppm spray (after appearance of 3rd true leaf)
After transplanting: 8-10 ppm spray (7-10 days after transplanting)
Bedding Plants (holding): 11-15 ppm spray
Petunia On plugs: 2 - 6 ppm sprench at radicle emergence, 10-15 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 15-20 ppm spray (5-7 days after transplanting) 1-2 ppm drench (apply after root system is established)
Phlox On plugs: 2 - 6 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 10-15 ppm spray (7-10 days after transplanting)
Portulaca On plugs: 6 - 10 ppm sprench at radicle emergence, 10-15 ppm spray (after appearance of 3-4 true leaves)
After transplanting: 15-20 ppm spray (7-10 days after transplanting)
Salvia On plugs: 6 - 10 ppm sprench at radicle emergence, 15-20 ppm spray (after appearance of 1st true leaf)
After transplanting: 20-26 ppm spray (7-10 days after transplanting)
Snapdragon On plugs: 6 - 10 ppm sprench at radicle emergence, 12-20 ppm spray (after appearance of 1st true leaf)
After transplanting: not recommended
Verbena On plugs: 6 - 10 ppm sprench at radicle emergence, 12-20 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 15-26 ppm spray (7-10 days after transplanting)
Vinca On plugs: 2 - 6 ppm sprench at radicle emergence, 7-16 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 10-20 ppm spray (7-10 days after transplanting)
Viola On plugs: 2 - 6 ppm sprench at hook, 3-7 ppm spray (after appearance of 3rd true leaf)
After transplanting: 8-10 ppm spray (7-10 days after transplanting)
Bedding Plants (holding): 11-15 ppm spray
Zinnia On plugs: 2 - 6 ppm sprench at radicle emergence, 7-12 ppm spray (after appearance of 1-2 true leaves)
After transplanting: 10-15 ppm spray (7-10 days after transplanting)

Specific Species and Application rates [Back to top]

Suggested Trial Rates on Perennials

The amount of A-Rest* required for an optimum growth response depends upon stage of growth, container size, method of application, and seasonal/varietal responses. Cultural practices and environmental conditions such as potting media, irrigation, fertilization, light, humidity and temperature will also affect the growth response to a given dosage.

Therefore, growers should establish and maintain records of application rates based on small-scale treatments under actual use conditions, for individual species and varieties. Generally, growers in northern, cooler climates will use rates at the lower end of the ranges listed. Growers in warmer, southern climates will use rates at the upper end of the ranges.

Note: A-Rest has been found to be effective on the following species of perennials. Unless otherwise noted, A-Rest should be trialed at a base rate of 26 ppm as a foliar spray or at 2 ppm as a soil drench. Adjust rate up or down according to the results obtained in your initial trial.

A-Rest + B-Nine® combinations have been shown to be more effective than either product alone on some perennials. A trial rate of 10 ppm A-Rest + 1,875 ppm of B-Nine is suggested.


Crop/species (responsive variety) Application Rates and Comments
Achillea Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Alternanthera/Joseph's Coat Spray 35-132 ppm, Drench 2-4 ppm.
Alcea Spray 10 ppm in plug stage.
Anacyclus Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Aquilegia (Star series) Spray 10 ppm A-Rest + 1,875 ppm B-Nine as needed.
Armeria Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Asclepias tuberosa See Note Above.
Bleeding Heart/Dicentra See Note Above. When used as a foliar spray at concentrations greater than 132 ppm, curling and burning of foliar will occur.
Bluebell/Campanula rotundifolia See Note Above.
Boltonia (Pink Beauty) Spray 15 ppm A-Rest + 1,250 ppm B-Nine as needed.
Catananche Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Clematis See Note Above.
Columbine Spray 65-132 ppm, Drench 2-4 ppm (apply when five to eight leaves have developed per plant).
Cornflower Spray - after transplant 10-15 ppm. Finished 15-26 ppm.
Cosmos See Note Above.
Crepe Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Delphinium Spray 30-132 ppm, apply when plants are well rooted but prior to flower initiation, 8 ppm in plug stage; Drench 2-4 ppm.
Echinacea purpurea (Bravado) Spray up to 100 ppm.
Eupatorium coelestinum Spray 66-99 ppm.
Gaillardia (Burgundy) Spray 15 ppm A-Rest + 2.5 ppm Sumagic® as needed.
Gardenia See note above.
Gaura Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Gerbera Daisy Spray 25-132 ppm; Drench 2-4 ppm.
Gypsophila Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Helenium Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Hibiscus Spray 10 ppm in plug stage.
Holly See note above.
Hydrangea See note above.
Hyssopus Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Iberis Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Isotoma Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Jasione Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Lantana See note above.
Lathyrus Spray 10 ppm - early plug stage if needed.
Lavendar/Lavandula (Lady) Spray 10 ppm in early plug stage.
Lavandula angustifolia
   (Munstead Dwarf)
Spray < 100 ppm.
Liatris See note above.
Lobelia/Lobelia x speciosa
   (Compliment Scarlet, Queen Victoria)
Spray < 100 ppm.
Linum perenne Spray 30 ppm.
Lupinus Spray 10 ppm in early through late plug stage.
Malva Spray 10 ppm in plug stage.
Moluccella Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Monarda Spray 10 ppm in early through late plug stage or Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Nemesia Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Nepeta Spray 10 ppm in early through late plug stage.
Papaver Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Penstemon Spray 10 ppm in early through late plug stage.
Platycodon Spray 10 ppm in plug stage.
Poppies Spray 12 ppm in plug stage.
Primula Spray 4 ppm in plug stage.
Pyrethrum Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Salvia Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Santolina Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Saponaria Spray 10 ppm in early through late plug stage.
Scabiosa Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Silena mexicana Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Thymus serpyllum Spray 10 ppm in plug stage.
Verbascum Drench 1 ppm stage 3 plugs, 1-2 ppm for finish.
Veronica x (Sunny Border Blue) Spray < 100 ppm.

Specific Species and Application rates [Back to top]

Bulbs Crops

The amount of A-Rest required for an optimum growth response depends upon pot size, stage of growth, method of application, season and varietal response. Species-specific cultural practices such as watering, potting media, fertilization and temperature will also affect the growth response to a given dosage.

Therefore, you should establish specific application rates based on small-scale treatments under actual use conditions and keep records as to plant species and variety sensitivity. Generally, growers in northern, cooler climates will use rates at the lower end of the range, while growers in warmer, southern climates use rates at the upper end of the ranges listed.

Asiatic Lily
 2.4 ppm drench as a trial base rate
   (Apply 8 oz. for a 6-inch pot when shoots are 3 - 5 inches tall)

Dahlia tuberous
 2-4 ppm drench
   (Apply to uniformly moist potting soil approximately two weeks after planting)
   The cultivars Siemen, Doornbosch and Honey may not respond satisfactorily to A-Rest
   treatment.+

Easter Lily
 30-70 ppm spray; 50 ppm is the most common rate
   (Apply when newly developing shoots are 2 - 3 inches in length; a second application when
   shoots average 6 inches in length may be needed)
 0.5 - 1.5 ppm drench; 1 ppm is the most common rate
 If a single drench of 1 ppm is used; it is applied when shoots average 3 - 5 inches in length.+
 If two applications are scheduled (at 0.5 ppm each), the first is made when shoots are
   2 - 3 inches in length and the second when shoots are 6 inches in length, as with foliar
   sprays.+

Oriental Lily
 2 ppm drench as a base rate
   (Split applications of 0.25 mg per 6" pot have been effective. Apply the first treatment at
   emergence, the second around 14 days later.)

Tulip
 1-4 ppm drench
   (Apply to moist growing media within 2 to 5 days after planting in greenhouse. Apply 2 ounces
   of solution to 4-inch pots and 4 ounces of solution to 6-inch pots.)

+Always read and follow label directions and precautions.

Specific Species and Application rates [Back to top]

Holiday and Other Flowering Pot Crops

The amount of A-Rest required for an optimum growth response depends upon pot size, stage of growth, method of application, season and varietal response.

Species-specific cultural practices such as watering, potting media, fertilization and temperature will also affect the growth response to a given dosage.

Therefore, you should establish specific application rates based on small-scale treatments under actual use conditions and keep records as to plant species and variety sensitivity. Generally, growers in northern, cooler climates will use rates at the lower end of the range, while growers in warmer, southern climates use rates at the upper end of the ranges listed.

Azalea
 53 ppm base spray (apply after plants have been trimmed)

Chrysanthemum
 26 - 52 ppm spray (best to apply the spray in a split application of 13 - 26 ppm, one week
   apart, when auxiliary shoots that develop following the pinch are 2.5 - 3 inches long)
 1 - 2 ppm drench (apply at same time as spray to plants with good root systems)
 On sensitive varieties: 26 ppm spray (best to apply the spray in two applications of 13 ppm,
   one week apart, just before the plants have reached the desired final height)

Poinsettia
 1-2 ppm drench (with target height of 6-inch pot being 15 inches, apply when plants are
   12 - 13")
 May also be applied as a drench after the start of short days.
 Drench applications of A-Rest after the start of short days have been shown to have very little
   effect on bract size or quality.

Specific Species and Application rates [Back to top]

Poinsettia

A-Rest is a very effective treatment for controlling the height and improving the quality of poinsettias. A single drench application can be utilized to substitute for several applications of weaker PGR's. A couple of Cycocel applications early in the crop growth cycle may help to even the crop. Drench applications of A-Rest after the start of short days have been shown to have very little affect on bract size or quality. Therefore, A-Rest may have application not only as a treatment to decrease application labor costs but also as a late emergency treatment.

Plants should be pinched and grown under normal cultural and fertilizer regimes.

Application timing: The timing of the application should be based upon the height of the Poinsettias in relation to your height goal. If your final plant height goal is 15" then you should apply A-Rest when the plants are 12 - 13" tall. Many growers will cull any plants the day before application that are shorter than the 12 - 13" and treat them later after they have reached 12 - 13". In this way they get a very uniform crop.

Trial Setup and Directions
Growers have indicated to us that the optimum rate for A-Rest as a drench for Poinsettias is between 1 - 2 ppm. Your climatic and environmental growing conditions will determine the best starting rate. In warmer climates, look at the higher end of the rate range. You can determine the size of the trial. One ounce of A-Rest in one gallon of water is enough to treat 32 plants.

6 inch Potted Poinsettias

Rate Amt. of A-Rest/Amt. of Water Vol./Pot Will Treat
1.0 ppm .5 ounce A-Rest/1 gal. water 4 oz/6" pot 32 plants
1.5 ppm .75 ounce A-Rest/1 gal. water 4 oz/6" pot 32 plants
2.0 ppm 1 ounce A-Rest/1 gal. water 4 oz/6" pot 32 plants
3.0 ppm 1.5 ounce A-Rest/1 gal. water 4 oz/6" pot 32 plants

Cost: Treatment cost is less than 4 cents per pot at the 2.0 ppm rate

Specific Species and Application rates [Back to top]

B-Nine is a registered trademark of Uniroyal Chemical Company, Inc. Sumagic is a registered trademark of Sumitomo Chemical Company.
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