Penstemon is a popular genus of perennials, shrubs and sub-shrubs that are grown for their colorful flowers. Native to hot and sunny regions of North America, the genus of Penstemon offers a wide range of perennials that can be grown at many different spots in gardens and landscapes. The taller species (1.5 to 3 meters) mix well with other perennials in borders. The low-growing species (1 to 1.5 meter) of Penstemon make good plant for rock gardens or flower beds.
Most species of Penstemon produce dense spikes of tubular flowers that bloom in early summer and last till mid-summer. Penstemon are easily propagated from seeds or divisions planted in spring. These sun loving plants require good sunny exposure in rich and loamy soil that gives its roots plenty of room to grow. Once established, Penstemons requires average watering.
Popular varieties of Penstemon include:
Penstemon ‘Alice Hindley’: Grows up to 1 meter and produces large mauve flowers.
Penstemon ‘Osprey’: Grows up to 1.5 meter and produces pink and white flowers.
Penstemon ‘Raven’: Grows up to 1 meter and produces lovely purple flowers.
Penstemon ‘Stapleford Gem’: Low growing plant with large lilac flowers.
Penstemon ‘Sour Grapes’: Another small perennial with greyish-blue flowers.