What factor contributes to the formation of thatch?

The formation of thatch is significantly influenced by the dense roots of grass. Thatch is comprised of a layer of organic material, including dead grass clippings, roots, and other plant debris that accumulates on the soil surface. When grass develops a robust root system, it can lead to an increase in the production of organic matter as more roots die off and decompose more slowly than they are produced. This accumulation contributes to thatch formation.

While other factors such as watering practices, soil health, and mowing frequency can influence the overall health of turfgrass and its growth, they are not primary contributors to thatch formation in the same direct way that dense root systems are. For example, excessive watering can lead to other issues, such as disease, and healthy soil typically promotes the breakdown of organic matter rather than its accumulation. Regular mowing helps manage grass height and can reduce thatch if done correctly, but it does not result in the same buildup of organic material as dense root systems do. Therefore, the density of grass roots stands out as a critical factor in the formation of thatch.