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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.
Further below: Details for all lamp types and where to get them. When you grow cannabis, you will put your plants initially under 18 hours of light. For the remaining 6 hours they need total darkness. This 18/6 hours period is called âvegetative stageâ.