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The difference between river rock and landscaping rocks is size, smoothness, and use. River rocks are smooth and flat, as if polished by water, and come in diameters between 1 and 8 inches. Landscape rock can vary in size from small pea gravel installations to car-sized boulders. However, landscaping and river rocks are interchangeable in many situations. River rock is best for pathways, walkways, garden bed mulch, water features, and planting accents, while small landscape rocks can serve as a walkway base, gravel playground areas, and filler between pavers.

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. 

Keeping your gravel driveway beautiful—or any gravel structure for that matter—does call for regular maintenance. You may occasionally need to add more gravel to low areas if you notice any pooling after rainfall. Gravel might also become excessively dusty over time. You can compact it with a mechanical compactor, which you can rent for around $80 to $85 per day.

To minimize maintenance requirements for your gravel, it’s important to ensure your land is properly graded before installing the gravel. It’s also helpful to lay landscaping fabric beforehand to keep it in place.

Rocks are less likely to attract snakes and other critters because their prey (termites, ticks, and other insects) don’t usually inhabit this environment. However, if you have placed together rocks with large spaces in between or near a source of water, you may find a snake or an occasional chipmunk seeking shelter.