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That depends on the number of cubic feet in each bag. Ten 2-cubic-foot bags of mulch will cover 20 cubic feet, while 10 3-cubic-foot bags of mulch will cover 30 cubic feet. Learning how to DIY mulch can save you money and help you repurpose natural items such as wood chips, pine needles, and leaves.

You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

The most important thing to put under a rock garden is the appropriate soil. The specific soil needed will depend on the type of plants you’re growing as well as the environment you live in. You can also put non-woven or woven fabric under the rocks to add to the garden's structural stability.

Stump grindings are usually safe to use in soil, but in some cases, it’s not recommended. Wood chips in particular can bind nitrogen in the soil, which will make it difficult for grass to grow. That’s why it’s important to remove most wood chips and use healthy garden soil if you want to cover the stump spot with grass. Large wood chips may attract beetles and could encourage the growth of fungi when they decay, so you may want to remove them when using the grindings.