Thatch is the layer of dead and living plant material, such as stems, roots, and leaves, that accumulates between the soil surface and the green vegetation in a lawn. A small amount of thatch is normal and beneficial, as it helps protect the roots and retain moisture. However, excessive thatch can prevent water, air, and nutrients from reaching the soil, leading to poor lawn health. Thatch can be managed by aeration or dethatching to improve the condition of the turf.
