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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.
Flowering is induced with 12 hours of uninterrupted darkness and 12 hours of light per day. The 12/12 day/night photoperiod triggers most strains of cannabis to flower The vegetative growth stage is only two to four weeks long in most strains when grown indoors.