Dethatching is a very important part of the Fall or Spring cleanup process
Thatch is the layer of dead grass, roots, and debris that accumulates between the soil surface and the green grass blades above. Almost every lawn needs a dethatching once a year.
A thin layer of thatch (less than ½ inch) can be beneficial for a yard, helping insulate it from extreme temperatures and reducing weed germination by preventing weed seeds from reaching the soil.
However, once the thatch gets out of control (more than ½ inch), it will form a barrier and keep moisture and air from providing nutrients to the soil.
Thatch buildup is not nearly as big a part of lawn care as is mowing, but you should not overlook its importance to the long-term health of your grass.