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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.
Now, letâs take a closer look at marijuanaâs four flowering phases: Pre-floweringâEven before you switch your lights to 12-12, your marijuana plants may be âshowing sex.â. Female primordial flowers, usually with only two white hairs at first, show up at stem junctions (nodes).