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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.
Near the end of early flowering phase, marijuana early flowers have turned into small, tight, dense clusters that start to fill in the stem internodes. This phase usually lasts 1-3 weeks after you switch to 12-12 lighting, depending on the genetics of your plants. In early flowering phase and in the flowering phases after it, providing your marijuana plants âextraâ phosphorus, potassium and carbohydrates, sets you up for a heavier, more potent harvest.