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Rocky Mountain penstemon | Plant Finder | Fill My Garden

Home/Plants/Perennials

Plants > Perennials

Rocky Mountain penstemon

Penstemon strictus

Genus: Penstemon
Family: Plantaginaceae
Common Names: stiff beard-tongue

About this plant

Evergreen perennial to 75cm tall, forming large clumps of rich green, lance-shaped, slender leaves and producing upright spikes of royal blue to purple tubular flowers, over a long period from early summer

Growing Information

Height

0.5-1 Metres

Spread

0.5-1 Metres

Hardiness

Foliage

Semi Evergreen

Growing Conditions

Sunlight

Full Sun

Soil

ClayLoamSandy

AcidAlkalineNeutral

Not Currently Available

This plant is not currently stocked at any garden centres on our platform.

Moisture

Well Drained

Aspect

West FacingEast Facing

Exposure

Exposed

Care Guide

Cultivation

Grow in fertile, well-drained soil in full sun or partial shade. In cold areas, protect plant overwinter with dry winter mulch. See penstemon cultivation

Pruning

Deadhead after flowering to maintain vigour and prolong flowering, then cut back to 15cm in late winter or early spring

Propagation

Propagate by seed in late winter or spring, softwood cuttings in early summer or semi-ripe cuttings in midsummer

Pests

May be susceptible to slugs, snails, aphids and leaf and bud eelworms

Diseases

May be susceptible to a downy mildew, grey moulds, Powdery mildews and a fungal leaf spot

Garden Uses

Uses

Cottage InformalFlower BordersGround CoverHedging ScreensPatio ContainerRock GardenBanks Slopes

Planting Places

IndoorOutdoorConservatory

Season of Interest

SpringSummerAutumnWinter

Size & Characteristics

Height

0.5-1 Metres

Spread

0.5-1 Metres

Habit

Clump Forming

Time to Full Height

Five To Ten Years