What does "lawn thatch" refer to?

Lawn thatch specifically refers to a layer of dead grass, roots, and other organic debris that accumulates on the soil surface beneath the green grass. This layer can inhibit water, air, and nutrients from penetrating to the soil, potentially harming the turf's overall health. When thatch builds up to an excessive thickness, it can create an environment that fosters pests and diseases, making it detrimental to the lawn's vitality. Understanding this concept is crucial for lawn care maintenance, as managing thatch levels is essential for promoting healthy grass growth and a robust lawn ecosystem.