Rocky Mountain penstemon
Also known as: stiff beard-tongue
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
Scientific classification
- Species
- Rocky Mountain penstemon (Penstemon strictus)
- Genus
- Penstemon
- Family
- Plantaginaceae
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- Toxicity
- Herbaceous Perennial
- Plant type
- 0.5-1 metres
- Height
- 0.5-1 metres
- Spread
- Semi evergreen
- Foliage
- Clump forming
- Habit
- Spring · Summer · Autumn · Winter
- Season of interest
- Full sun
- Sunlight
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- Ideal temperature
Rocky Mountain penstemon pictures
Distribution of Rocky Mountain penstemon
Distribution map
United States
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Culture
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Toxicity
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Quick identification of Rocky Mountain penstemon
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Rocky Mountain penstemon care guide
- Light frequent watering, fully drain surplus moisture to prevent root rot
- Watering
- Full sun
- Sunlight
- Information to be completed
- Ideal temperature
Watering
Light frequent watering, fully drain surplus moisture to prevent root rot
Fertilizing
FertilizingLow-concentration penstemon feed every three weeks spring through fall
Pruning
PruningDeadhead after flowering to maintain vigour and prolong flowering, then cut back to 15cm in late winter or early spring
Propagation
PropagationPropagate by seed in late winter or spring, softwood cuttings in early summer or semi-ripe cuttings in midsummer
Growing
GrowingGrow in fertile, well-drained soil in full sun or partial shade. In cold areas, protect plant overwinter with dry winter mulch. See penstemon cultivation
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Common pests and diseases
Diseases
May be susceptible to a downy mildew, grey moulds, Powdery mildews and a fungal leaf spot
Pests
May be susceptible to slugs, snails, aphids and leaf and bud eelworms
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