first off are you growing "sog" method? If so, then flower early. How much room you got? After switching the light cycle for flowering the plant will almost double it's size.. I flower my plants from seedling on the 6th week and get about 20-24" plants and yeild at least a dry oz. or more each plant of top quality bud. During the first 4-5 weeks of flowering i use 14 hrs of light then the last 4 weeks i switch to 12 hr cycle, then for the last 3 days i keep them in complete darkness before harvest to produce even more resin. Hope this helps :smokin: