i flush seven to ten days before harvest depending on strain, if my plants are in 2 gallon pots i flush with 6 gallon of water, flushing removes all the nutes and salts from the soil , then the plant draws the last of the goodness from the plant and it stops your buds from tasting of the chemilcals that are present in the nutes, and no questoin is stupid in the quest for knowledge if you dont ask you do not learn, the postman.