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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.

Gravel driveways require regular maintenance because the material can shift over time. Routine tasks include raking the gravel to ensure an even layer, filling in ruts or low spots, and removing debris, especially after storms. You should also add fresh gravel as needed to prevent potholes, remove weeds by hand or with an herbicide, and occasionally spray the driveway with water to reduce dust.

Periodically, you may need to grade and level the entire driveway, which is often done every few years. Any refilled potholes should be compacted; for excessive dust, you can use a mechanical compactor. To minimize future maintenance, ensure the land is properly graded before installation and consider laying down landscaping fabric to help keep the gravel in place. In areas with heavy rain, reinforcing the edges can help prevent erosion. Additionally, it's best to avoid using a snowplow on a gravel driveway during the winter.

While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.

Yes, you can put new mulch over old mulch, since it’s decomposable. The only reason you should remove old mulch before laying new mulch would be to maintain a certain aesthetic.