What is thatch in relation to grass growth?

Thatch refers to a layer of organic material that accumulates between the soil surface and the green vegetation of grass. This layer is primarily made up of dead grass stems, roots, and other organic debris that have not fully decomposed. In the context of grass growth, thatch can impact the health of the lawn significantly. While a small amount of thatch can be beneficial, as it helps retain moisture, too much thatch can restrict the movement of water, air, and nutrients to the grassroots. Therefore, understanding what thatch is and its role in grass growth is essential for maintaining a healthy lawn and effectively managing lawn care practices.