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No, gravel and crushed rock are different. Crushed rock is made in a quarry and has sharp, jagged edges. It’s most commonly used for building and construction.

Gravel naturally occurs in river beds or lakes and features smooth edges, making it a better choice for landscaping or other decorative areas. Like crushed stone, gravel can also be found in quarries, but it’s typically due to rock-on-rock erosion rather than machinery.

A 40-pound bag of topsoil covers 0.76 cubic feet, enough for 4.5 square feet with a 2-inch depth or 36 square feet with a .25-inch depth, such as topdressing a standard garden bed. If you want 2 inches of fresh topsoil for your 36-square-foot garden bed, you’ll need eight 40-pound bags.

To prepare your yard for river rocks, smaller rocks may require laying landscape fabric to keep the stones from sinking into the ground while encouraging proper water drainage. You should also clear the land of weeds and larger boulders and, in some cases, test the density of the soil to ensure it can handle the weight.

Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep.