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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.
Marijuana Flowering Timeline. Depending on the type of weed youâre growing, the marijuana flowering stage can take anything from 6 weeks for a short flowering Auto strain, 7 â 10 weeks for Indica dominant strains and 10+ weeks for the Sativa dominant strains.The following guideline gives you an idea what to expect during flowering. 1-2 weeks â After switching to 12/12 marijuana light cycle, your marijuana plant will start to show its first flowers. â¢ 3-5 weeks â Plants start to stretch for light and flowers will appear at the nodes.