Follow what it says on the bottle. Some plants barely stretch at all but some will double in size but its rare after 3wks.Start the bloom now. Follow the instructions instead of following strangers, I can't express that enough, and that includes my advice. Most companies are more than happy to help. Your soil/coco would of had more than enough nitrogen in it.The bloom will have plenty of nitrogen to deal with the stretch. The bloom has a little less nitrogen and more P-Phosphorus and K-Potassium which is needed to set the buds,P gives it the energy and K helps it to build cells, among other things.
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