i personally water for the last 3 days lightly of course, with plain water and then they get 3 days straight dark no water no nothing, i personally dont really beleive in a flush though...plants flush themselves, my weed doesnt taste bad or burn funny, but i just probably started something more than i wanted to, anyway just giving my opinion from experience, let it go 3 weeks and chop, 4 if u really wanna get stoned...good luck buddy