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Several calls have been coming in concerning poinsettias - here are a few
growing tips as you finish out your crop.



*Watering / Fertilizer:*

1. Water as needed with water soluble fertilizer 20-10-20 @ 250 ppm until
Oct 15th

2. Water as needed with water soluble fertilizer 15-0-15 @ 200 ppm from Oct
15 until finish date.

3. Water with plain water every 5th watering.

4. Over-watering will result in plant decay, root rot and disease problems.

5. Letting plants dry up will result in loss of finish foliage and possible
crop loss.


*Light:*Poinsettias need full sunlight.  The *shade cloth should be removed
by now*.  If you have other plants that need shade, pull the shade cloth
back and allow full sun for your poinsettias and shade for the other
plants.


*Heat: *Night Temperature should not be below 60 degrees, Day Temperature
should not be below 70 degrees.


*Space on Bench:  *space plants according to size to avoid stretching

6" pot space 12" on center, 8" pot space 18" on center, 10" pots space 24"
on center


*Height control*: Most schools grow Freedom poinsettia varieties and you
may be able to finish these plants without growth retardants.  If you are
pushing these plants with fertilizer, heat, and plenty of light, they would
be helped by an application of growth retardant.  If you are growing other
varieties, a growth retardant may be necessary to keep the plants from
stretching.  This is especially true for the schools in the Central and
South Regions that are growing the white variety, Snowcap.  This is an
aggressive variety and must have a retardant to keep them within a
desirable height.  If you plan to use a regulator, *apply it before October
15 *or the bracts size will be reduced.  Here are some growth regulators
and rates.  Remember that plants should be *well water  and the leaves
allowed to dry before you spray. *

Cycocel - Use 1 ounce per gallon (1000 ppm) of water on Freedom varieties
and 1 1/2 (1500 ppm) ounces per gallon on taller varieties. Spray on a
cloudy day or in late afternoon.

B-Nine -   Use 3 tablespoons per gallon (3,700 ppm) of water.  Spray on a
cloudy day or in late afternoon.

B-Nine / Cycocel mix - This is the most effective way of controlling height.
Use 2 tablespoons of B-Nine and 1 1/2 ounces of Cycocel mixed into one
gallon of water. Spray on a cloudy day or in late afternoon.


*Insecticides*:  Whiteflies are a serious pest of poinsettias.  It is almost

impossible to control whiteflies without Marathon.  Application of Marathon

should take place about 3 weeks after planting.  The insecticide is a

systemic and a good root system is necessary for the plant to take up the

Marathon.  If you see whiteflies before the Marathon is applied, use

Orthene, soap, or Sanmite to kill the early insects.  If you have other

plants in the greenhouse, make sure they aren't the source of your

whiteflies (lantana is often a host for whitefly).





*Fungicides:* Apply late October soil drench application, use as a
preventative to avoid plant disease. *
*

Clearys 3335 or Banrot
--
Dr. Teri Hamlin
North Region Agriculture Education
Georgia Department of Education
204C Four Towers University of Georgia
Athens, Ga 30602
706-552-4461 / 706-540-0032
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