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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.
Leave the grow light on for 16 hours each day. Turn it on in the morning just after sunrise and shut it off 16 hours later. Vegetable seedlings need eight hours of darkness, too.