Lawn & Soil Care

What Is Thatch?

Thatch is a layer of living and dead grass stems, roots, and related plant material between green shoots and the soil surface.

Concept diagram: Green grass shoots; Interwoven thatch layer; Mineral soil below.
Green grass shoots; Interwoven thatch layer; Mineral soil below. Simplified conceptual illustration; not to scale.

How to Understand It

A thin layer can be part of healthy turf. Excessive buildup may hinder water movement and seed contact with soil. Loose leaves and ordinary surface clippings are not the same as the interwoven thatch layer.

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