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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.
Most plants will require about 12-16 hours of light per day. They also require at least 8 hours of darkness each day. Start by setting the timer for 12 hours of light and 12 hours of darkness and adjust the light time upwards if your plant does not appear to thrive.