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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.
Many growers (& I tend to agree with this) feel though that the plants appreciate 4-6 hours of darkness as a ârest periodâ. That said, for the last 3 weeks of flowering, when you really want to max out your bud potential, its often worth leaving the lights on for the full 24 hours.