I like to keep the grow lights 1 inch above the plants for 17 hours a day at all times. I start them from seed in a screened mix of fox farm ocean forest, worm castings, and coco coir. I always have a constant breeze blowing on them to promote strong stems and to help keep them cool. If they get to warm they will be leggy. They may not be as dark green as home depot's plants but they will far out perform them any day of the week. No growth inhibitors necessary.
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