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How much 4 yards of dirt will cover depends on how deep you want the soil to be. In general, a yard of dirt will cover 324 square feet for a 1-inch depth or 100 square feet for a 3-inch depth. Therefore, you can expect 4 yards to cover between 400 and 1,296 square feet if you keep your soil depth between 1 and 3 inches.

Yes, it is possible to add too little mulch. Anything less than 1 inch will likely result in too little coverage around your plants, allowing weeds to grow through and minimizing the positive effects that a deeper bed of mulch would have, like maintaining proper soil moisture and insulating the ground.

Nonorganic mulch, like river rocks, pebbles, or lava rock, technically lasts the longest. It helps with moisture retention and weed control but doesn’t break down and release nutrients like organic mulch. Wood mulch decomposes slowly, which can help it last longer than leaf or straw mulch, but it won’t provide as many nutrients as quickly as the faster decomposing types.

Mulch costs anywhere from $30 to $150 per cubic yard, depending on the type you choose. On the inexpensive end, red and black mulch are about $35 to $40 per cubic yard, and are typically made from recycled waste wood like shredded old pallets or deck material. Cedar, cypress, and rubber mulch cost anywhere from $100 to $120 per cubic yard. A pro can help you determine the type of mulch most suitable for your landscaping needs.