Get matched with top mulch and topsoil pros in Manderson-White Horse Creek, SD

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.

Yes, and in many cases, you should. Large gravel works best as a base layer because it improves drainage and keeps the surface stable. A top layer of smaller gravel fills in gaps and creates a smoother, more compacted surface. This combination is common in driveways and high-traffic areas where both stability and comfort matter.

You should use mulch because it protects garden soil in a few key ways. This extra layer between the ground and the elements protects against erosion, helps your soil maintain moisture, regulates changes in temperature, adds nutrients as it decomposes, and keeps weeds at bay.

The number of bags of topsoil you need depends on the depth you’re filling. The average topsoil is sold in a roughly forty-pound bag, covering 12 square feet at a one-inch depth. Since topsoil is by nature the uppermost layer of soil, you can bet on only needing to fill about 4 to 8 inches of soil depth with it.