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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.
If you want your marijuana plants to start pre-flowering just change the light cycle to 12 hours on and 12 hours of complete darkness. Why does this work, well letâs think about how plants are in their natural environment.f you are growing in soil you should add a fertilizer that is high in phosphorous and potassium such as âSuper Bloomâ. Read more about marijuana nutrients. Whilst in the flowering stage it is important that plants receive no light outside of their 12 hour day cycle.