Overview
Penstemon confertus is a bushy, upright, semi-woody at the base perennial in the genus Penstemon, part of the Plantaginaceae family, with semi-evergreen or evergreen; narrow, glossy, mid to dark green foliage. It typically grows around 0.6 m tall. Penstemon confertus grows best in full sun, and tolerates most soils and neutral to alkaline pH. Its UK hardiness is rated H3-H5. It is native to W Canada and USA (NW & Alaska).
About
Penstemon confertus is a perennial with upright, well-branched stems and semi-woody bases, growing to about 0.6 m. From June to September it bears tiers of pale yellow to cream tubular flowers. Leaves are narrow, glossy and semi-evergreen. It prefers full sun on light, neutral to alkaline, free-draining soils.
Wikipedia contributors, CC BY-SA 4.0 — Penstemon confertus
About the genus
Penstemon, the beardtongues, is a large genus of roughly 280 species of flowering plants native to North America from northern Canada to Central America. It is the largest genus of flowering plants endemic to North America. As well as being the scientific name, penstemon is also widely used as a common name for all Penstemon species alongside beardtongues.
Wikipedia contributors, "Penstemon", CC BY-SA 4.0 — Penstemon
In the garden
Penstemon confertus is a compact perennial native to western Canada and the north‑west United States, including Alaska. It forms upright, well-branched clumps to roughly 0.6 m and carries tiers of pale yellow to cream tubular flowers from June to September, adding summer colour without tall stems. Plant it in full sun on a south- or west-facing, sheltered site where soil is light, fertile and freely draining — a loam or sandy mix on neutral to alkaline ground suits it best. Avoid winter- wet locations, as waterlogged soil is the main cause of losses. The species is rated H3–H5 for the UK, meaning survival ranges from borderline to hardy; choose the warmest, most sheltered microsite in cooler districts and ensure excellent drainage. Use Penstemon confertus at the front of well-drained borders, on gravel beds or rockeries where its low clump and long-flowering display are visible. Its semi-evergreen, narrow leaves and semi-woody bases help the plant maintain structure through milder winters when given a free‑draining, south- or west-facing position with shelter from prevailing winds.
Growing conditions
Best soil and position for Penstemon
- Sunlight
- Full sun
- Soil type
- Light, fertile, free-draining loam or sand
- Soil pH
- Neutral to alkaline
- Soil moisture
- Well drained; winter wet causes most losses
- Aspect
- South or west facing
- Exposure
- Sheltered
- UK hardiness
- H3-H5
Plant details
Penstemon confertus size, habit and characteristics
- Plant type
- Perennial
- Habit
- Bushy, upright, semi-woody at the base
- Foliage
- Semi-evergreen or evergreen; narrow, glossy, mid to dark green
- Height
- 0.6 m
- Native to
- W Canada, USA (NW & Alaska)
Care notes
Pruning and caring for Penstemon confertus
- Cultivation
- Drainage and shelter decide whether a penstemon is perennial or annual in your garden. Plant in spring rather than autumn so the roots establish before winter, and leave the top growth standing until spring as crown protection. Regular deadheading is what sustains the extraordinarily long season. Given the modest hardiness of most cultivars, taking cuttings every summer is sensible insurance.
- Pruning
- Leave stems intact over winter, then cut back to low healthy buds in mid-spring once frosts have passed. Deadhead continuously through summer, cutting spent spikes to a side shoot.
- Propagation
- Semi-ripe cuttings taken in late summer root quickly and are the standard method - and the usual replacement for winter losses. Species can be raised from seed.
- Pest resistance
- Slugs take young spring shoots; capsid bug and eelworm occur but are uncommon.
- Disease resistance
- Powdery mildew and leaf spot appear on crowded plants. Root rot follows winter waterlogging.
Frequently asked questions
How do I grow Penstemon confertus?
Drainage and shelter decide whether a penstemon is perennial or annual in your garden. Plant in spring rather than autumn so the roots establish before winter, and leave the top growth standing until spring as crown protection. Regular deadheading is what sustains the extraordinarily long season. Given the modest hardiness of most cultivars, taking cuttings every summer is sensible insurance.
Where is the best place to plant Penstemon confertus?
Penstemon confertus prefers full sun. It suits sheltered positions.
What soil does Penstemon confertus need?
Penstemon confertus is adaptable and grows happily in most soil types, including light, fertile and free-draining loam or sand. It prefers neutral to alkaline soil. Aim for soil that stays well drained; winter wet causes most losses.
How do I prune Penstemon confertus?
Leave stems intact over winter, then cut back to low healthy buds in mid-spring once frosts have passed. Deadhead continuously through summer, cutting spent spikes to a side shoot.
How big does Penstemon confertus grow?
Penstemon confertus reaches a height of 0.6 m.
Is Penstemon confertus hardy in the UK?
Penstemon confertus has an RHS hardiness rating of H3, meaning it is half-hardy, tolerating -5 to 1°C, and may need winter protection in colder areas.
How do I propagate Penstemon confertus?
Semi-ripe cuttings taken in late summer root quickly and are the standard method - and the usual replacement for winter losses. Species can be raised from seed.
More in the Penstemon genus
- Penstemon 'Raven'Beardtongues
- Penstemon campanulatusbellflower beardtongue
- Penstemon campanulatus 'Andenken an Hahn'Penstemon
- Penstemon campanulatus 'Evelyn'Beardtongue
- Penstemon campanulatus 'Garnet'Penstemon
- Penstemon campanulatus 'Hidcote Pink'Beardtongue
- Penstemon campanulatus 'Pink Endurance'Beardtongue
- Penstemon cyananthusBlue Penstemon
