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How to Induce Flowering. Because of photoperiodism, you can easily induce flowering in cannabis plants simply by changing your grow room light cyclesâreducing the light from 18 hours a day or more, to only 12 hours each day.
To make a poinsettia flower for the holidays, the plant must be kept in total darkness for fourteen hours each night during the months of October, November and early December. During that same time the plant should also receive six to eight hours of bright sunlight each day.