Thatch, built-up plant material between green growth and the grass roots, is essential, but too much can deter healthy lawn growth.
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You can leave your grass clippings on the surface of the lawn after you mow. In order to prevent the buildup of thatch, mow frequently so the grass clippings are small and will decompose rapidly. Grass clippings contain 16 essential nutrients -- including nitrogen fertilizer you've applied -- that can be recycled back into the lawn by leaving the clippings in place.
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