DAY LENGTH: Response of Plants

Culture Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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Cattleya warscewiczii does not respond to day-length; if a hybrid with it in its genes, flowers in early summer and the sheath is green and fleshy, it will not respond to photoperiod control. A86-815
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Day Length Comments
DAY LENGTH: Increased by Artificial Light Cattleyas may not flower with too much light, under lights and with kitchen lights on full. A86-1031Fall flowering cattleyas most respond to light; increase the day length by turning on lights for four hours from 10 p.m. to 2 a.m. each night; several weeks later after lights are turned off the plants should begin to flower; start lights in mid-July to delay fall-flowering cattleyas into winter. F74-165 0
DAYS, SHORT: Effects Cloudy weather can cause short days effect; stimulates flowering; weak light causes shortage of carbohydrates. A77- 36 0
DAYS, SHORT: How Many Required to Set Cattleya Buds Sometimes as few as five days; some crippling of flowers will show if too-long days follow the bud set period. A70-798 0

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