Thatch

Definition:

Thatch

A dead, organic layer of stems, leaves and other matter that accumulates on the surface of the soil below the grass line. Thatch is a helpful element in lawn care it if it in a thin layer, which can limit weed growth and protect some grasses from early frosts. Too much thatch however - over ½ inch thick - encourages insect infestation, an unpleasant growing environment for grasses, and some lawn diseases. Core aeration is the proper lawn treatment for reducing thatch.

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