Rocky Mountain PenstemonRocky Mountain Penstemon (Penstemon strictus) is a hardy perennial native to the Rocky Mountains, known for its striking spikes of shades of purple, tubular flowers. Highly drought tolerant and long lived, it thrives in well drained soils and is a favorite of pollinators, attracting bees, hummingbirds, and butterflies. Its evergreen foliage provides year round interest, adding texture and color even when not in bloom. Rocky Mountain Penstemon pairs