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.