Determine how many bags of deep brown mulch will be needed to cover the desired area. One bag, which contains 2 cubic feet, will cover 12 square feet at a 2-inch depth, 8 square feet at a 3-inch depth and 6 square feet at a 4-inch depth, according to Scotts.
Spread the mulch around established plants or trees at an average depth of 3 inches. Avoid spreading the mulch on areas where garden or plant seeds have not germinated or around plants that aren't established.
Ensure the mulch is at least 3 to 4 inches from the home's foundation and wood, including tree trunks.
Moisten the mulch with the misting attachment on the hose. The mulch absorbs and distributes water, reducing weekly maintenance.