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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.
This section will take you through the basics of the marijuana flowering stage: from when to begin the marijuana flowering cycle; how long it will take; what marijuana light cycle to use as well as more advanced advice on nutrients. 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. Your plant will start to develop creamy white pistils from its flowering points.