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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.
Marijuana Light Cycle. Indoor Growing. To start your plant flowering when growing indoors, you need to mimic the lighting conditions found in Fall/Winter. This means taking the plant from the 18/6 marijuana light cycle used in the vegetative growth stage, and changing it to 12 hours light/ 12 hours darkness.