|This short-lived perennial, often treated as an annual in colder climates, is grown primarily for its pretty, tubular, two-lipped flowers, coming in all colors but blue and yellow. The leaves are narrow and lance shaped. Penstemons like dry, but rich soil. They are mid summer bloomers, attract hummingbirds, and will keep your garden exciting after the spring colors have faded away. P. ambiguus bears profusely, from early summer to early fall, phlox-like, white to rose-pink flowers, with rose-purple reverses.