Robertsanswered grow question 3 years ago To flush means you provide only ph water. For ripening it is looking at trichromes on buds not leaves and ideal high thc content is when they are all super cloudy and might have a few Ambers in there. Flushing takes about 2 weeks depending upon substrate. Long the more it will color morph if it can. Also promotes ripening. I generally start my flush when buds have fattened and most of white hairs are red/brown. Trichromes are real sign to read. If you need more information. Select my answer then direct message me. Good luck