|This short-lived perennial, often treated as an annual in colder climates, is grown primarily for it's pretty, tubular, two-lipped flowers (all colors but blue and yellow). The leaves are narrow and lance shaped (up to 4 inches long). Penstemons like dry but rich soil. They are summer bloomers, attract hummingbirds, and will keep your garden exciting after the spring colors have faded away. Penstemon cardwellii is a spreading, occasionally stem-rooting, evergreen subshrub. Produces in early summer, few-flowered, raceme-like panicles of slender, tubular, funnel-shaped, deep purple flowers. Grows 4 to 8 inches tall, 12 inches wide.