Leaving grass clippings on the lawn is acceptable to do every time the lawn is mowed. The concept that clippings left on lawns will cause thatch build-up has been disproven. Thatch is a brown, spongy material consisting of dead grass stems and roots. Excessive thatch is undesirable because it prevents water and air from penetrating to grass roots. A healthy population of microorganisms and earthworms in the soil can digest thatch. Grass clippings break down quickly and encourage the beneficial earthworms and microorganisms that maintain healthy grass and healthy soil. Regular core cultivation (aeration) is the best way to prevent thatch. For additional information on leaving lawn clippings, see the fact sheet Eliminate Grass Clipping Collection.

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