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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.
Daily Light Exposure. Most plants require upward of six hours of bright sunlight or artificial light in the proper spectrum hues every day. Some plants will require or thrive with much longer light periods up to 14 hours per day. Most plants also require a night interval or no light rest period for optimal growth and performance.