From David Beaulieu,
Your Guide to Landscaping.
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Definition: Mulch is a covering placed around plants (or covering the ground in lieu of plants), to prevent the growth of weeds. If placed around plants, a mulch provides additional benefits, including the diminution of erosion and water loss, and the regulation of soil temperature. In addition, upon decomposition (for organic mulches), mulches serve as soil amendments. Mulch selection is usually based on appearance, as well as on all the practical considerations mentioned above.