How to Select Gravel Sizes

Gravel is a versatile, budget-friendly paving material that can meet many needs in your landscape. The key decision isn't what color of gravel to choose; it's what size to use. That is because not all gravel is created equal, and the size that you would use for a walkway isn't necessarily the best option for a rock garden. If you consider the type of project and how much foot traffic the area will receive, then selecting the right size of gravel doesn't have to be a challenge.

Choosing the right gravel size for garden paths or walkways can make a significant difference in how comfortable they are to walk. Typically, the smaller or finer gravel is, the softer it is under foot, which is particularly important if you plan to walk on it in bare feet. Opt for gravel that is 1/4 inch or smaller in diameter for the most comfortable walking surface. Choose gravel that has a smooth texture, too, because rounded edges are less likely than sharp ones to hurt underfoot.

In a large paved area such as a patio or driveway, gravel's size can help create a firm, stable surface. For a patio, select gravel that is 3/8 to 3/4 inch in diameter. A driveway requires a few layers of gravel to provide enough stability for vehicles. Start with a layer of stones that are about the size of baseballs or softballs, typically 3 to 4 inches in diameter. Next, install a layer of 2- to 3-inch-diameter stones. The driveway's top dressing should consist of 3/8-inch-diameter gravel. For both a patio and driveway, though, opt for crushed, man-made rock gravel because its pieces bind together well, increasing stability.

Gravel is an effective mulch for plants because it helps prevent evaporation from the soil surface and, unlike wood mulch, isn’t prone to moving in wind. Gravel that is 1/4 inch or smaller in diameter may be moved more easily than larger gravel, though. So opt for medium-size gravel for flowerbeds and around trees. An all-purpose gravel that is 3/8 inch in diameter works best for mulch around plants. Smooth gravel has a more decorative appearance than rough, angular gravel when used as mulch, but rough gravel may stay in place better.

Virtually any size of gravel can be used in a rock garden. That is because a rock garden doesn’t tend to have heavy foot traffic, and so the gravel merely serves as decoration. Large gravel is often the best choice because it stands well against boulders and other large rocks that may be in the rock garden. Try 1- to 1 ?-inch-diameter gravel as the top dressing in a rock garden. Smooth gravel made from river rock features rounded edges that can give the area a more decorative appearance.