the stuff in your nutes that your plant absorbs are mostly non mobile once absorbed. that means you can pour the whole fucking ocean on that plant, and the stuff you're trying to get rid of will still be there. so all you've done is starve your plant for the last week or two of its life, when it could have been packing on weight and trichs. i've experimented myself, grown plants i've flushed and plants i didn't. ash was the same color, tasted the same, burned the same.....the only difference was the plants i didn't flush looked a little healthier, weighed just a little more....