What is thatch?

Thatch is a loose (spongey) intertwined accumulation of both dead and alive grass roots, stems, and shoots. This layer exists in-between the actual soil surface, and the green vegetation. Thatch occurs when growth outpaces the rate at which it can be broken down by soil organisms. A small amount of thatch is healthy as it can help insulate the majority of your lawns root system from extreme temperatures as well as help to retain soil moisture. Too much thatch can greatly inhibit the flow of air, water, and nutrients into the soil.