Dusty Penstemon (Penstemon comarrhenus) is a lovely Penstemon option that brings subtle color to waterwise landscapes. Low mounds of pale gray, finely textured, "dusty" foliage create a luminous base that contrasts beautifully with surrounding greens, while late spring to early summer brings upright stems of tubular light blue to soft purple flowers. These nectar-rich blooms are a favorite of native bees and hummingbirds. Dusty Penstemon thrives in lean, well-drained soils and full sun. Since its stems can be tall and few in number, we recommend planting it in groups behind or among other dry perennials and grasses for a pop of vertical interest and soft color in dry garden beds and borders, rock gardens, Mediterranean style gardens, or naturalistic designs. Do not overwater or the tall stems can become brittle and prone to breakage. 
Photo Credit: HQ