Modern poinsettia varieties stay attractive for a long time if given proper
care. Place your poinsettia in a sunny window or the brightest area of the
room, but don’t let it touch cold windowpanes. The day temperature should be
65 to 75 degrees F. with 60 to 65 degrees at night. Temperatures above 75
degrees will shorten bloom life, and below
60 degrees may cause root rot. Move plants away from windows at night or
draw drapes between them to avoid damage from the cold.
Poinsettias are somewhat finicky in regard to soil moisture. Avoid
overwatering because poinsettias do not like “wet feet.” On the other hand,
if the plant is allowed to wilt, it will drop leaves. So how do you maintain
proper moisture? Examine the potting soil daily by sticking your finger
about one inch deep into the soil. If it is dry to this depth, the plant
needs water. When it becomes dry to the touch, water the plant with lukewarm
water until some water runs out of the drainage hole, then discard the
drainage water.
By: Ward Upham