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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.
That is to say, the plant will not flower despite the fact that the light cycle was changed to 12 hours of darkness/12 hours of light a few weeks ago? There are three probable causes of this problem: the light has stayed on too long, the room has a few light leaks, or the light was turned on during the dark time.