labifleanswered grow question 6y ago Hey gardener! Even if your harvest is partial, you should flush because in the end, you don't want to smoke the fertilizer residues that are in your plant. But if you grew without fertilizers, there's no need to flush since you have no excess fertilizers to get rid of. I admit you were planning to use several fertilizers like cannabis, while the flush should just be done with water at the right pH, and at worst, you add a flushing agent that cleans the soil faster. So, water at the right pH in large quantities, then harvest and resume fertilizing for the last yield. Good luck, bella ciao!