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The ideal amount of mulch is the square footage of your desired depth in inches divided by 324. Aim to keep your old and/or new mulch at a depth of no more than three or four inches.

The depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.

Before you put down grass seed, you should cultivate your soil or add two inches of topsoil. You should also put down fertilizer at the same time as your seed to prompt healthy growth. Be sure to water after you put down grass seed, especially for the first two weeks.

Mulching any time of year can be beneficial, so you can choose based on your preference. Most homeowners avoid the winter and summer because of the uncomfortable temperatures, so spring and fall are often best. Try not to mulch right before heavy rainfall or a big storm is expected, as wind and runoff can move newly laid mulch around and make more work for you.