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Description
Penstemon azureus, commonly known as the Rocky Mountain penstemon, is a species of flowering plant in the family Plantaginaceae. It is native to the United States, specifically to Colorado, New Mexico, Arizona, and Utah. The plant grows up to 60 cm tall and produces blue-violet flowers that bloom in late spring to early summer.
Taxonomic Information
| Domain | Eukaryota |
|---|---|
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Lamiales |
| Family | Plantaginaceae |
| Genus | Penstemon |
Appearance
The Rocky Mountain penstemon has lance-shaped leaves that are green and slightly hairy. The flowers are tubular and grow in clusters on long stems. They are blue-violet in color and have five petals that are slightly curved. The plant blooms from late spring to early summer and attracts bees and other pollinators.
Care Guide
The Rocky Mountain penstemon prefers well-drained soil and full sun to partial shade. It is a drought-tolerant plant and does not require frequent watering. Fertilization is not necessary, but a slow-release granular fertilizer can be applied in early spring. The plant is hardy in Zones 4-9 and can withstand temperatures as low as -34°C.
Common Pests & Diseases
The Rocky Mountain penstemon is generally resistant to pests and diseases. However, it may be susceptible to spider mites, leafhoppers, and aphids. Powdery mildew and root rot can occur if the plant is overwatered or grown in poorly-drained soil.
Habitat
The Rocky Mountain penstemon is native to the rocky slopes and meadows of the western United States. It is commonly found in the mountains of Colorado, New Mexico, Arizona, and Utah. The plant is adapted to the dry and arid conditions of its habitat and can survive in harsh environments.
Question and Answer
Q: Is the Rocky Mountain penstemon a perennial or an annual?
A: The Rocky Mountain penstemon is a perennial plant that returns year after year.
Q: What is the best time to plant the Rocky Mountain penstemon?
A: The best time to plant the Rocky Mountain penstemon is in the spring, after the last frost has passed.
Q: Can the Rocky Mountain penstemon be grown in containers?
A: Yes, the Rocky Mountain penstemon can be grown in containers as long as they are large enough to accommodate the plant’s root system.
Q: How often should the Rocky Mountain penstemon be watered?
A: The Rocky Mountain penstemon is a drought-tolerant plant and does not require frequent watering. Water only when the soil is dry to the touch.
Related Plants
- Penstemon fruticosus
- Penstemon grandiflorus
- Penstemon palmeri
- Penstemon virgatus
References
- https://www.fs.fed.us/wildflowers/plant-of-the-week/penstemon_azureus.shtml
- https://www.gardeningknowhow.com/ornamental/flowers/penstemon/rocky-mountain-penstemon-care.htm
- https://www.wildflower.org/plants/result.php?id_plant=PEAZ
