Discover Penstemon plants for summer flowers, upright stems and foliage that adds another layer of colour to the border. Explore the dramatic dark leaves of ‘Onyx and Pearls’, compact Dakota Burgundy and the pink-blushed white flowers of ‘Husker Red’. Give them a sunny spot with well-drained soil, and combine them with hardy geraniums, salvias or ornamental grasses for a relaxed planting scheme.