johdlonganswered grow question 3 years ago I count day 1 immediately on switching to 12/12. I stop feeding 2-3 weeks before harvest based on the breeders recommendation, keeping the "release rate" of your fertilizers in mind (slow or fast release: all fertilizers have "release rates", even natural fertilizers like bokashi and FPJ/FFJ: my personal favorites. I harvest only when the trichomes tell me they are ready, keeping the breeders recommendations in mind. I pull all at once because I don't have any extra climate controlled space to dry my lady's outside of the grow, but I've heard of strategies of staggering the harvest (chopping the tops first as they mature faster), in order to allow the lowers to mature more.