30 (50)cm, Bush Penstemon is a dwarf shrublike perennial with densely arranged, semi-woody stems with numerous, small, light lilac blue, almost completely flat flowers. It is native of Arizona, Colorado, Kansas, New Mexico, Oklahoma, Texas, Utah (USA), and in Mexico. For any rich, very well drained, slightly rocky or sandy soil in full sun. Excellent in the rock garden. VI-VII.