as of the 2007 census, there were 2.2 million farms in this country. i defy you to find one of those 2.2 million farmers who flush anything. because it doesn't do anything beneficial. if you're only doing it for a week, its probably not going to do major damage to an otherwise healthy plant, but it's not going to remove a single molecule of anything you've been feeding that plant. period. ever. it can't. it doesn't work that way. there aren't little pockets of nutrients waiting to be used up, it all dissolves and is sent up the roots, through the xylem, to the stem and leaves . the leaves use these dissolved nutrients to carry out photosynthesis, then send their products out to the rest of the plant through the phloem. unless you're overfeeding like a fiend, the stuff you feed your plant gets used up almost as soon as you add them, they don't sit around on the plant like fat. plants don't get "fat", they burn if you over feed them. that's why you have to keep feeding them. if you stop feeding them, they stop growing as soon as they use up the reserves in the medium, which shouldn't last more than a few days, they don't draw on their reserves to keep growing, they don't have any reserves internally. thats why lower older leaves turn yellow when you have an N deficiency, they're sucking the life out of their own active leaves to feed new growth. why would they do that if they had reserves to draw on?