what is thatching grass

Thatching grass is a layer of organic matter that accumulates on a lawn around the base of the grass plants). It is a combination of living and dead plant matter, including crowns, stolons, rhizomes, and roots). Thatch is composed of about 25% lignin, a complex organic polymer that is highly resistant to decomposition). Certain grass species are especially prone to thatch production, and acidic soils may not be able to support sufficient populations of decomposing microorganisms, leading to thatch buildup). Grass clippings do not generally contribute to thatch buildup as they can be easily broken down by soil microorganisms). A small amount of thatch may provide a beneficial insulating effect against fluctuations in temperature and moisture, but excessive thatch can cause root problems and lawn mower difficulties). A dethatcher may be used to remove thatch from a lawn).