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Description
Penstemon Cardwellii, also known as Cardwell’s penstemon, is a perennial plant species that belongs to the family Plantaginaceae. This plant species is native to the western United States, specifically in Montana, Wyoming, and Idaho. Penstemon Cardwellii usually grows up to 1 to 2 feet tall and 1 to 2 feet wide. It produces tubular-shaped, lavender flowers that bloom from late spring to early summer.
Taxonomic Information
| Domain: | Eukaryota |
| Kingdom: | Plantae |
| Phylum: | Spermatophyta |
| Class: | Magnoliopsida |
| Order: | Lamiales |
| Family: | Plantaginaceae |
| Genus: | Penstemon |
Appearance
Penstemon Cardwellii has narrow, lance-shaped leaves that grow up to 2 to 4 inches long. The leaves are green and have a slightly fuzzy texture. The flowers of this plant are tubular-shaped and grow up to 1 inch long. The flowers are usually lavender in color, but some may have pink or purple hues. The plant’s stem is usually upright and can be slightly woody or herbaceous.
Care Guide
To care for Penstemon Cardwellii, you should plant it in well-draining soil that is rich in organic matter. This plant species prefers full sun exposure, but it can tolerate partial shade. Water this plant regularly, especially during hot and dry weather. Fertilize the plant once a month during the growing season using a balanced fertilizer. Penstemon Cardwellii is hardy in USDA hardiness zones 3 to 8.
Common Pests & Diseases
Penstemon Cardwellii is susceptible to spider mites, thrips, and aphids. These pests can be controlled using insecticidal soap or neem oil. This plant species is also vulnerable to root rot if the soil is too wet. To prevent root rot, make sure to plant this species in well-draining soil.
Habitat
Penstemon Cardwellii is native to the western United States and is commonly found in open meadows, rocky slopes, and forested areas. This plant species prefers well-draining soil and full sun exposure.
Question and Answer
Q: Is Penstemon Cardwellii a good plant for beginner gardeners?
A: Yes, Penstemon Cardwellii is a relatively easy plant to care for and is a good choice for beginner gardeners.
Q: Can Penstemon Cardwellii grow in containers?
A: Yes, Penstemon Cardwellii can grow in containers as long as the soil is well-draining and the container is large enough to accommodate the plant’s root system.
Q: How often should I water Penstemon Cardwellii?
A: Water Penstemon Cardwellii regularly, especially during hot and dry weather. Make sure to allow the soil to dry out slightly between waterings.
Q: When should I prune Penstemon Cardwellii?
A: Prune Penstemon Cardwellii after it has finished blooming to promote bushier growth and to prevent the plant from becoming leggy.
Related Plants
- Penstemon digitalis
- Penstemon barbatus
- Penstemon eatonii
- Penstemon procerus
References
- “Penstemon Cardwellii.” Lady Bird Johnson Wildflower Center. https://www.wildflower.org/plants/result.php?id_plant=PECA15
- “Penstemon Cardwellii.” Missouri Botanical Garden. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=280836&isprofile=0&cv=5
- “Penstemon Cardwellii.” Plant Database. https://www.plantsdatabase.com/plants/penstemon-cardwellii
