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Nonorganic mulch, like river rocks, pebbles, or lava rock, technically lasts the longest. It helps with moisture retention and weed control but doesn’t break down and release nutrients like organic mulch. Wood mulch decomposes slowly, which can help it last longer than leaf or straw mulch, but it won’t provide as many nutrients as quickly as the faster decomposing types.

If you like the look of mulch in your plant beds, be aware that it can attract a variety of pests, including termites. To avoid wood-to-foundation contact, leave a one-foot barrier around your house and fill it in with rocks or gravel, starting mulch past that barrier and working it outward into your plant beds. 

Mulch costs anywhere from $30 to $150 per cubic yard, depending on the type you choose. On the inexpensive end, red and black mulch are about $35 to $40 per cubic yard, and are typically made from recycled waste wood like shredded old pallets or deck material. Cedar, cypress, and rubber mulch cost anywhere from $100 to $120 per cubic yard. A pro can help you determine the type of mulch most suitable for your landscaping needs.

Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep.