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its real good to flush them out a couple times definitley, many dont out of lazyness but I usually try to squander at least once a crop, thats not including the last flush which is sometimes the most "inventive" thing about pot growing..
well with seedlings its a different story dutch....i mean when they get to like 4 or 5 inches or 3 or 4 sets of leaves..you can start a more agressive feeding schedule, and a lil run off never hurts