How many people flush before harvesting? I use GH Flora Kleen and I do it for 2 hours between veg and flowering and then again after 4 weeks of flowering and then I do a final flush for the last 4 days before harvest. Are there any negatives to flushing. I am on my 8th grow and even though I have dealt with algae on this grow it has turned out to be a great one. The reason I ask is that on my last grow I lost some due to bud rot but the humidity was a little to high. This grow my humidity is less than 40%. I read somewhere that flushing can cause bud rot, anybody heard this?