A mulch kit is designed to lift your grass clippings up under your mower deck so they can be cut again by the mower blades. By cutting the grass into smaller pieces, you have a neater yard and the grass breaks down more quickly, releasing much needed nitrogen into the ground and fertilizing your lawn. If you choose to bag your grass, mulching blades are still beneficial as the smaller clippings will work well in your compost pile. In the fall, mulch kits are especially helpful in taking care of thin layers of leaves or the stragglers you couldn't get with the rake. The leaf pulp will also help fertilize the lawn when it breaks down. Shop some of our best-selling mulch kits and mulching mower blades below.