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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.
Unlike traditional (referred to as photoperiod) strains, autos donât need any special kind of light schedule to âtellâ the plant to start budding. With a photoperiod strain, a cannabis plant needs 12+ hours of darkness a day to initiate flowering.