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The main benefit of topsoil is that it enriches the soil with nutrients that help your plants and garden grow at a healthy rate. Topsoil improves how well your soil drains water and gives it a more fertile texture, so that not only do you get better planting, but weeding is also much easier.

When you purchase mulch for delivery, it’s usually by the cubic yard, so you’ll want to convert your space to cubic yards to get the right amount. First, determine the square footage of the area you want to cover, and then determine how deep the bed of mulch will be—a good rule of thumb is around three inches. Multiply your square footage in feet by the depth in inches and divide by 324. You may want to add a ½ to one additional cubic yard to ensure you have enough.

Topsoil provides plants with essential nutrients, water, and air for healthy root growth. It offers a rich ecosystem of microorganisms that improve soil quality and structure. For existing lawns, ¼ inch of topdressing can enhance root growth and support new seed. For gardens, two inches of topsoil can promote strong growth and crops.

You shouldn’t put topsoil over new grass seed. Even though it may seem like this would increase soil contact and help the seeds grow, adding more soil overtop of planted grass seed will only make it harder for water and oxygen to reach the grass seeds. If you want to protect the grass seeds, consider adding a thin layer of organic matter, such as straw or hay.