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Mulch is a layer of organic material like leaves, aged wood chips, compost or grass clippings that you spread around your plants. Place one to three inches of pesticide-free mulch in your flower beds and vegetable gardens. Use 2 to 3 inches around trees, shrubs and wood perennials. Keep mulch about an inch away from stems and tree trunks. When you mulch your garden you are being earth friendly in many ways: