Penstemon ‘Stapleford Gem’ (Beardtongue)

A very popular Penstemon variety, award-winning Penstemon ‘Stapleford Gem’ is an exquisite perennial, adorning gardens with tubular lavender-blue flowers, accented by subtle white throats with fine purple-maroon lines, from late spring to early autumn.

Penstemon ‘Stapleford Gem’: An In-depth Look

Native: This cultivar is not a native species but derived from parent species native to North America.

Plant Type and Habit: It’s a herbaceous perennial with a semi-evergreen habit in milder climates. It has a clump-forming habit that makes it suitable as a border plant.

Size: This Penstemon grows 24 inches tall and wide (60 cm), adding lovely vertical lines to the landscape.

Flowers: It boasts large, richly colored bell-shaped flowers, 1.5 in. long (3.5 cm). The blooms are a lovely mix of bright lilac trumpets with pale lilac-pink upper lips, white lower lips, and throats exhibiting a delicate purple-maroon veining. This attractive color palette makes it easy to fit most garden color schemes. The flowers are held on erect, wine-red stems.

Bloom Time: Expect a spectacular show from late spring through fall.

Foliage: The flowers rise above the foliage mound of shiny, lance-shaped leaves.

Award: Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.

Uses: This Penstemon is versatile, suitable for border plantings, container gardens, rock gardens, and as part of pollinator-friendly landscapes. Good as cut flowers, too!

Pollinators: Penstemon attracts various pollinators, especially bees and hummingbirds, drawn to the nectar-rich flowers.

Toxicity: Penstemons are not known to be toxic to humans or pets. However, it’s always prudent to prevent ingestion of any non-edible plants.

Deer and Rabbit: A bonus is its resistance to deer and rabbits, a characteristic attributed to the texture and taste of the foliage that these animals generally find unappealing.

Drought: Once established, this Penstemon shows good drought tolerance. While it prefers consistent moisture levels, it can endure short periods of dry conditions, a boon for gardeners in more arid climates.

Invasiveness: Penstemons are not known for being invasive.

Penstemon Growing Tips

Light: Full sun (at least 6 hours of direct sun per day). Tolerates light shade.

Soil: Well-drained soil is crucial. Penstemons prefer rocky or sandy lean soils rather than rich garden loam. Avoid overly moist, poorly drained soils.

Water: Water well until plants are established. Once established, Penstemons tolerate some drought. Allow the soil to dry out between waterings. Over-watering or wet soils can lead to root rot.

Fertilizer: Penstemon plants generally do not require heavy fertilization and can thrive in relatively lean soil conditions. However, providing them with a light application of an organic fertilizer in the fall can help boost their growth and flowering potential.

Pruning: Deadhead spent flowers to encourage continuous blooming. Cut back plants in late autumn or early spring to promote vigorous growth.

Mulching: Mulching Penstemon can help regulate ground temperature and suppress weed growth. Choose a mulch that does not hold water. Use organic materials like shredded bark, compost, or pine straw. Avoiding direct contact with the stems to prevent rot and pest issues.

Propagation: Propagate by softwood cuttings in early summer or semi-hardwood cuttings in midsummer. Propagate by division in spring.

Pests and Diseases: No serious pest or disease issues, but watch for slugs, snails, and nematodes. Fungal diseases can occur in overly wet conditions; ensure good air circulation and avoid overhead watering to prevent issues like powdery mildew, leaf spot, and root rot. Rust can cause small, rust-colored pustules on leaves and stems, leading to defoliation and stunted growth.