By Kelly Weston, Native Landscapes, a printable PDF version is available here.

The seven principles of Xeriscape

5. Mulches
Mulching is essential for Xeriscape gardening. Mulch helps keep plants roots cool, prevents soil from crusting, minimizes evaporation and reduces weed growth. Mulches also give beds a finished look and increase the visual appeal of your garden.

Organic mulches, such as bark chips, pole peelings or wood grindings, should be applied at least 4 inches deep. Because they decompose over time, they are an excellent choice for new beds. As plants mature and spread, they will cover the mulched area.

Inorganic mulches include rocks and gravel, and should be applied 2 inches deep. They rarely need replacement and are good in windy spots. However, they should not be placed next to the house on the sunny south or west sides,because they tend to retain and radiate heat. Mulch may be applied directly to the soil surface or placed over a landscape fabric. (Note: Do not use black plastic because it prevents air and water from reaching the plant roots.)