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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 flowering light cycle is based on plants that are a 9 week flowering strain. Heres a breakdown of how you should set your timers for your HPS lights in your flowering or bud room: Weeks 1-2: Set your timer for 11 hours on and 13 hours off. Weeks 3-4: Set your timer for 10.5 hours on and 13.5 hours off. Weeks 5-6: Set timers on for 10 hours and off for 14 hours. Weeks 7-8: 9.5 hours on and 14.5 hours off. Week 9: set timers to 9 hours on and 15 hours off. this is the final week of flowering and you should be âflushingâ your plants to remove all chemicals and nutrients from the roots.