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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.
The growing cycle is also controlled by light. This is one of the main advantages of growing marijuana indoors. Initially in the grow period (vegetative), lights are kept on for approximately 18 hours a day. When you want the plants to begin flowering the light is restricted to 12 hours light (and 12 hours dark).arijuana Lighting. All plants need light and there is no sun indoors. The light provided by the sun needs to be replaced with an artificial light source. Incandescent lights, like regular light bulbs, simply won't cut the mustard, they put out light in the wrong spectrum and are too costly to run.