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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.

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.

You can choose from various kinds of organic mulch and inorganic mulch. Organic mulch may be in the form of wood chips, pine needles, and compost and eventually decompose. Inorganic mulch, such as gravel, rocks, and landscape fabric, is more durable but doesn’t help the soil.

That depends on the number of cubic feet in each bag. Ten 2-cubic-foot bags of mulch will cover 20 cubic feet, while 10 3-cubic-foot bags of mulch will cover 30 cubic feet. Learning how to DIY mulch can save you money and help you repurpose natural items such as wood chips, pine needles, and leaves.