The Bush Hog brand has uplift blades on the rotary mower. When run with the front and back of the mower approx 1 inch off of level ground, it will mulch the grass and leave it clean behind the mower. The grass is actually being cut at least twice. It will also do this if the front is a little higher than the rear. If you run the front lower than the rear, it takes less horse power to run, but only the front of the blades do the actual cutting and a lot of the grass is thrown to the side. /w3tcompact/icons/smile.gif