Native to the limestone hills of the Chihuahuan Desert, Trailing Indigo Bush is one of the most successful groundcovers of the Southwest. This low-growing evergreen has the ability to form roots wherever its stems touch the ground, making it an excellent soil stabilizer and enabling it to rapidly spread 6-8 feet or more while maintaining a mounding height of only 2 feet. If left unchecked, Trailing Indigo Bush will form a dense, rolling carpet over harsh, rocky areas and banks, where it can survive on as little as 11 inches of rainfall a year. In spring, small purple blossoms appear in abundance, attracting butterflies to your garden.