Thatch is a layer of dead grass, roots, and other organic material that accumulates on the surface of soil in lawns and gardens. It can build up when grass clippings and leaves are not properly decomposed, creating a barrier that can prevent water and nutrients from reaching the soil. A small amount of thatch can be beneficial, but excessive thatch can lead to problems like poor drainage and increased pests. To manage thatch, homeowners often use a process called aeration, which involves perforating the soil with holes to allow air, water, and nutrients to penetrate. Additionally, regular mowing and proper lawn care practices can help minimize thatch buildup. If thatch becomes too thick, dethatching tools can be used to remove it effectively.