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While you can put gravel directly on dirt, it won’t be very stable. It also won’t block out any weeds. Most experts recommend layering weed barrier and a layer of packed sand or other foundation material to prevent the gravel from sinking into the earth and being overtaken by weeds.

Gravel is a versatile option for home projects. It is low-maintenance and cost-effective compared to other materials. In addition, gravel provides excellent drainage, reducing the risk of flooding in your yard or driveway. Pairing gravel with a weed barrier fabric during installation can mitigate the risk of weed growth.

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. 

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.