At Lawn A Mat, we’ve been making lawns beautiful in Bergen & Passaic Counties in New Jersey and Orange & Rockland Counties in New York since 1961. We’ve done thousands of lawns in these areas. What is Thatch? Thatch is a tightly bound layer of dead grass, including leaves, stems and roots that builds up on the soil surface at the base of the living grass of a lawn. Your lawn needs up to 1/2” of thatch because it’s a beneficial part of your lawn’s ecosystem since it provides