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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 need to add topsoil before you hydroseed to ensure the roots can grow deep. You should cultivate and add compost or amendments to your soil before hydroseeding for optimal growth. Without topsoil, your hydroseed might not take root, leading to wasted effort and money down the drain. Soil preparation is key to the success of DIY hydroseeding.

A 50-pound bag of pea gravel equals approximately one-half of a cubic foot. That amount will cover a three-square-foot area to a depth of about two inches. A three-square-foot area with equal-length sides is approximately 1.73 feet by 1.73 feet, or about 20.75 inches on each side.

While you can put gravel directly on dirt, it won’t be very stable. It also won’t block out any weeds. Most experts recommend layering weed barrier and a layer of packed sand or other foundation material to prevent the gravel from sinking into the earth and being overtaken by weeds.