These tender, shrublike perennials offer colorful tubular blossoms from spring to fall. They hold up well in heat, but they must have good drainage. Where stems are not killed to the ground by frost, shear to about 6 in. high in late winter.
D. resupinata. Zones CS, TS; USDA 9-11. Root hardy to about 22F. Native to washes and rocky slopes from southeastern Arizona and southwestern New Mexico south into Mexico. Open growth to 2 ft. tall, 23 ft. wide, with branches sparsely foliaged in elongated, heart-shaped, inch-long, dark green leaves that take on an attractive purplish cast in cool weather. Slender, rosy purple, -in.-long flowers bloom from late spring to fall. Sometimes reseeds but is not invasive. Little or no water.
D. suberecta. HUMMINGBIRD PLANT. Zones LS, CS, TS; USDA 8-11. Native to Uruguay. Woody-based perennial 2 ft. tall, 1 ft. wide, with grayish green, softly downy leaves 13 in. long and about half as wide. Summertime clusters of bright orange-red, 1-in.-long flowers attract hummingbirds. Moderate to regular water.