okay, and im saying why harvest a pre mature plant. just grow what you want. no you cant grow OG kush and harvest early to get some kali mist, or strawberry cough. the answer is no.
You can however, look at your harvest window for individual strains to determine what kind of high you want from the bud, but that comes with experience and trial and error. once you have grown a plant a few times, harvested and smoked it a few times you know when you let your plant go too long because you cant motivate your ass after you hit the bowl, or you harvested to early, and the high isnt quiet what you expect/need.
savy?