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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.
Lastly, prepare for the bloom. Phalaenopsis orchids are triggered to bloom by temperature. A few cold nights are necessary to stimulate a flower spike. For many people, this means the plants will bloom in the fall when household temperatures can drop as much as 10 degrees overnight.