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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.
You can even keep the plants under 24 hours of light and they will continue to grow in this stage. However, the recommended growth cycle is 18 hours of light during the vegetative growth stage. This light cycle will create an enviornment that mimics the photoperiod in the summer with long days.ow that you have your LED grow light, you must use it properly for optimum growth and yield. The biggest mistakes people make with LEDs are not having enough light and not placing the light at the proper distance.