smoke24answered grow question 4 years ago Flushing is not necessary, if you want to you can give it plain water for the last week. Check the breeders flowering time, most are typically around 60-70 days so i'd say you have at least 3 weeks left, but keep and eye on the trichomes as that is the ONLY accurate way to tell exactly when its time to harvest, look for 10-20% amber. Happy growing.