THC is produced by the plant in the flowering stage, mainly in resinous trichomes that form on the buds. Lesser amounts are found in the leaves. Plant maturity, thus highest potency, is attained anywhere from 7-12 weeks after flowering begins and is largely dependent on the strain. When examined under a microscope, trichomes will first appear clear, gradually turn cloudy, and then amber colored. Most are harvested when trichomes begin turning amber. Harvest too soon, and the high will be racier and short lived. Late harvest produces more of a stone than a high, but again, very dependent on individual strain.