Lavandula angustifolia (English lavender)

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.

'Jason' has bright yellow-green foliage with rich amethyst blue flowers in late summer and fall. It's a vigorous grower for a mixed border or mass planting in sunny areas.

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.

This clumping evergreen shrub with narrow leaves produces a startling, 3- to 4-foot-tall flower stalk. The fragrant flowers are pale green or greenish white. It is a tenacious weed in areas of the American West, but adds a touch of the desert to gardens. Soap can be made from its roots and the foliage is used in basket-making.