Santolina chamaecyparissus (Lavender cotton)

Giant-flowered purple sage has been winning over gardeners the past few years for its remarkable summer blooms and tough-as-nails demeanor. Native to the dry foothills and mountains of southern California, this sage is considered a woody shrub. It features showy, aromatic silver foliage and bicolored flower spikes with lavender-purple calyces and long, hummingbird-pollinated blue flowers. It grows from 24 to 36 inches high.

Found in the Great Basin deserts of the western U.S., Salvia dorrii is by far one of the most beautiful native Salvia species. A small, woody shrub, it comes into bloom in late spring with short spikes of showy purple bracts and blue flowers. The semievergreen foliage is distinctively silvery gray and highly aromatic. It grows to 18 inches high.

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A native perennial shrub that grows to about 2 feet tall and wide and covers itself the whole season with honey-scented, white and yellow daisy flowers. The foliage is typical of the aster family. Plant en masse in a well-drained border or use in a rock garden. Blackfoot daisy can be short-lived.

This easy to grow evergreen yucca bears dramatic, sword-shaped yellow leaves with a dark green edge. Not as staunchly upright as some yuccas, its leaf tips sometimes droop with age. Its foliage color is best from fall to spring. Plants grow to nearly 2 feet in height and 3 feet in width. In summer, it produces a 6-foot-tall spike covered with nodding, fragrant, white bell-shaped flowers.