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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 plants need 12-16 hours of light per day. Darkness is also important for plant growth so this gives your plants at least 8 hours of total darkness a day. Try to have the lights on at the same time every day. You can get an automatic power strip with timer for your lights to make it easier.