Dalea frutescens (Black dalea)

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.

Despite a soft, delicate appearance, trailing indigo bush is one of the toughest groundcovers around. The feathery, silvery green compound foliage makes the clusters of tiny, rosy purple flowers stand out at close range. The blooms, which occur most heavily in spring and summer, return sporadically the rest of the year. This plant is excellent for stabilizing soil on slopes because its stem nodes root wherever they come in contact with the ground.

This short-lived, tender perennial shrub native to the Canary Islands off the African coast sends up 6-foot white-furred stems cloaked with long, felted, arrow-shaped leaves and topped, summer to frost, with plumes of purplish violet flowers clasped by red-tipped calyxes. It grows up to 4 feet wide.

This southwestern native shrub grows to 20 feet tall and 15 feet wide and sports long, dull, spiny stems that green up and leaf out after a rain, followed by long, scarlet flowers that attract hummingbirds.When dry conditions return, ocotillo drops its leaves again. This cycle can replay several times a season. Great as a surprising specimen or forbidding hedge.