Manual and riding mowers produce a lot of grass clippings. Usually, people bag these clippings or clean them up with a blower after finishing. The third option is to turn those clippings into mulch to feed and fertilize your grass. Because they have small razor-like blades and cut more frequently than a human-operated mower, all robotic mowers are mulching mowers. The tiny tips of mowed grass are ground into fine powder by the blades and redistributed back to the soil.