Penstemon glaber (dwarf blue penstemon) — Clump forming

Overview

Penstemon glaber is a clump forming herbaceous perennial in the genus Penstemon, part of the Plantaginaceae family, with evergreen, semi-evergreen foliage. Penstemon glaber grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H4. Suggested uses include cottage and informal garden, city and courtyard gardens, coastal, gravel garden, patio and container plants, wildlife gardens and flower borders and beds.

About

Penstemon glaber, commonly known as sawsepal penstemon, is a species in the Plantaginaceae family from western North America. It grows as far north as Montana and North Dakota and as far south as Chihuahua in northern Mexico. It is native to North America, Colorado, Mexico Northeast, Montana, Nebraska and other regions. In the garden it prefers full sun and most soil types. In UK gardens it is hardy through an average UK winter (RHS H4). Suggested uses include cottage and informal garden, city and courtyard gardens, coastal, gravel garden, patio and container plants, wildlife gardens and flower borders and beds. It tolerates soil of any pH, well-drained conditions and south-facing, west-facing and east-facing aspects. Plant in well-drained soil in sun or part shade.

Wikipedia contributors, CC BY-SA 4.0 — Penstemon glaber

Growing conditions

Best soil and position for Penstemon

Sunlight: Full sun
Soil type: Loam, Chalk, Sand
Soil pH: Acid, Alkaline, Neutral
Soil moisture: Well-drained
Aspect: South-facing, West-facing, East-facing
Exposure: Exposed, Sheltered
UK hardiness: H4

Plant details

Penstemon glaber size, habit and characteristics

Plant type: Herbaceous Perennial
Habit: Clump forming
Foliage: Evergreen, Semi-evergreen
Suggested uses: Cottage and informal garden, City and courtyard gardens, Coastal, Gravel garden, Patio and container plants, Wildlife gardens, Flower borders and beds

Care notes

Pruning and caring for Penstemon glaber

Propagation: Softwood cuttings in early summer, Semi-ripe cuttings in midsummer, Division in spring
Pest resistance: Slugs, Snails, Glasshouse red spider mite, Leaf and bud eelworms
Disease resistance: Powdery mildew, Rust, Leaf spots, Southern blight

Frequently asked questions

Where is the best place to plant Penstemon glaber?

Penstemon glaber prefers full sun. It suits exposed and sheltered positions.

What soil does Penstemon glaber need?

Penstemon glaber is adaptable and grows happily in most soil types, including loam, chalk and sand. It is happy in soil of any pH. Aim for soil that stays well-drained.