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Yes, you can lay pea gravel directly on the dirt. First, dig a trench 2 to 6 inches deep the length and width of the area you want to cover. Plants and weeds will eventually grow through the pea gravel if you don’t lay down landscaping cloth.

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.

If you are xeriscaping a lawn from scratch, your best bet for preparing the lawn is to work with a xeriscaping specialist in your area. The most common first step to making the transformation, however, will be to remove the turfgrass from your lawn. The subsequent steps will often include amending the soil to support new plants and installing low-drip or drip irrigation systems.

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.