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Discover More Information On Rocky Mountain Penstemon
Penstemon strictus, commonly known as Rocky Mountain Penstemon or Rocky Mountain Beardtongue, is an evergreen herbaceous perennial that thrives in dry, rocky conditions. Its tall spires of tubular blue to violet flowers bloom from late spring to early summer, attracting native bees and other pollinators. This plant grows 1 to 3 feet tall and forms low mats of foliage, with leaves ranging from narrow and grass-like to broader, lance-shaped varieties. Ideal for dry, well-drained soils, this penstemon adds beauty and ecological value to xeriscapes and naturalized gardens.
Plant Attributes
The Penstemon strictus (Rocky Mountain Penstemon) is a tough, evergreen perennial known for its tall spires of blue to purple tubular flowers. It reaches heights of 1 to 3 feet, making it a prominent feature in native plant gardens or dry landscapes. This species thrives in USDA Zones 4 to 8 and prefers part shade and sandy or rocky soils with low water requirements. It tolerates heavy soils and moisture better than most other penstemons, although it prefers dry, light, well-drained conditions.
The striking tubular flowers have two lobes on the upper lip that project forward over the lower lip’s three deeply cut lobes. Blooming from May to August, these flowers are an important nectar source for native bees and other beneficial pollinators.
Landscape Use
Rocky Mountain Penstemon’s tall flower spikes and evergreen foliage make it a versatile choice for a range of garden settings. Here are some common uses:
- Rock Gardens: Its preference for sandy and rocky soils makes it an ideal choice for rock gardens and other dry landscapes.
- Pollinator Gardens: The vibrant flowers attract native bees, making it an excellent plant for pollinator-friendly spaces.
- Naturalized Plantings: Penstemon strictus is perfect for naturalized areas or native plant gardens where low water use and minimal care are important.
- Water-Wise Gardens: This drought-tolerant perennial is a standout choice for xeriscaping or other water-smart landscaping approaches.
- Perennial Borders: Use in sunny borders to add height, color, and texture throughout the summer.
Planting & Care
Rocky Mountain Penstemon is an easy-care perennial that thrives in well-drained, dry conditions. Follow these care tips for best results:
- Planting Location: Choose a location with part shade and sandy or rocky soils. While this penstemon tolerates heavier soils better than many other species, ensure it is planted in well-drained soil to prevent root rot.
- Watering: Water regularly during the first growing season to establish roots. Once established, it is highly drought-tolerant and only requires occasional watering in dry spells.
- Pruning: Remove spent flower spikes after blooming to encourage continued flowering. In early spring, clean up any old growth to prepare the plant for the new season.
- Propagation: Propagation is best through seed or root division. Sow seeds in the fall, barely scratching them into the soil, or divide roots in early spring, ensuring each division has at least one bud.
- Seed Treatment: Cold-moist stratification (2-3 months at 40°F) improves seed germination.
Additional Information
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Plant Features
- Height: 1-3 feet
- Width: Low mounding habit
- Zones: 4-8
- Bloom Time: May to August
- Flower Color: Royal blue, violet, or purple
- Sun Requirements: Part shade
- Water Needs: Low
- Soil Type: Sandy, rocky soils
- Maintenance: Low
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