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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.
depends on the strain of the plant. anywhere from 8 to 12 weeks. but keep in mind cannabis will not start flowering until it is in 12 hours of day light and 12 hours of darkne â¦ ss.f trying to sex your plants or just flower females, from my experience, I've found that most strains will start to show their sex/bud between the 3rd and 10th day of a flowering schedule (12/12 light).