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A light layer of mulch can help protect a tree, retain moisture, and keep the soil healthy. However, it’s important to avoid over-mulching or piling the mulch up around the trunk of a tree, a practice notoriously called “volcano mulching.” That piled mulch can increase the chances of rot and disease on the tree trunk as well as overwhelming the soil, which needs access to a certain amount of air. Topped trees have it hard enough: mulch sparingly while they heal.

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.

Hydroseeding is a great option for sloped yards, as sod might not root as well. Hydroseeding also traditionally creates sprouts faster than normal seeding—up to a full week faster. Additionally, you can customize your slurry mix with hydroseed, allowing you to create a mixture that will work specifically for your yard’s conditions. 

It’s important to remember that hydroseeded lawns require a lot of water during the first few weeks of installation, which can be time-consuming and costly. Additionally, the installation window tends to be shorter than that of sod and traditional grass. 

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.