Caryopteris × clandonensis (Blue beard, Blue-spirea, Blue-mist shrub )

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.

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.

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'Maraschino' bush sage is a superb Salvia that is irresistible to hummingbirds and gardeners alike. Even after dying back to the ground in winter in the cooler zones, this plant comes back in full force each spring, reaching its full height and covering itself with cherry red blooms by midsummer. The flowers bloom nonstop through the first hard frost, and the leaves are sweetly fragrant. Plants do best when given afternoon shade. 'Maraschino' grows to 3 feet tall.

‘Sixteen Candles’ summersweet is a newer cultivar of a popular native shrub. This compact selection reaches 3 to 5 feet tall. In summer, ‘Sixteen Candles’ is topped with aromatic, erect, butterfly-enticing white blooms for 4 to 6 weeks. In fall, the leaves turn an attractive yellow.