Answer: If they're allowed to age a bit, grass clippings make excellent mulch material. If you pile them on fresh, they'll mat down and repel water. I lay mine out in thin rows about 3" thick and allow them to weather until they're straw-colored. Then I rake them up and pile them around the bases of my plants, keeping them a few inches away from the trunks or main stems to allow for good air circulation. The only other caution - don't use grass clippings on veggie gardens if you've treated your lawn with herbicides. Hope this clarifies things for you!
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