|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 3 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 whippleanus bears in fall, narrow stems of whorled, purple, sometimes lavender or cream flowers, with the lobes of the lower lips larger than the lobes of the upper lips. To 24 inches tall, 12 inches wide.