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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 maintain vegetative growth, use 18-24 hours of light; six hours of darkness or less. To promote flowering, alternate 12 hours of light with 12 hours of darkness. When switching light cycles from vegetative to flowering, first give plants 36 hours of darkness. To harvest outdoor plants early, cut the time light reaches the plants to 12 hours each day.