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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.

While organic mulch offers many benefits, it can also attract bugs looking for shelter, food, and water. Insects, rodents, snails, and slugs are often attracted to its decomposing material.

Yes, you can custom-color your gravel if you’d like. Use an acrylic- or oil-based paint designed for outdoor use, and apply sealant to protect it from the elements. Some companies offer customized color gravel, either mixing the colorant in a cement mixer with gravel or using industrial mixers to dye, paint, or color it.

Among the most common types of gravel are pea gravel, crushed stone, marble chips, jersey shore gravel, and base gravel. Gravel has different densities depending on whether it’s wet or dry or mixed with sand.