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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.
The cocklebur is a classic example of a short-day plant (i.e. it only flowers when the nights are long). At least one leaf of a cocklebur plant needs 15 hours of darkness to undergo various complex biochemical reactions leading to the release of a hypothetical flower stimulant called florigen..