Penstemon Ambiguus, commonly known as the Sierra beardtongue, is a perennial plant that belongs to the plantain family (Plantaginaceae). This plant is native to the western United States and is found in the Sierra Nevada and the Rocky Mountains. It is a hardy plant that can grow up to 2 feet tall and 1 foot wide. The plant has showy, tubular flowers that bloom in late spring and early summer. The flowers are usually blue or purple, but they can also be pink, red, or white.
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Taxonomic Information:
| Domain | Eukarya |
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Lamiales |
| Family | Plantaginaceae |
| Genus | Penstemon |
Appearance:
The Sierra beardtongue has lance-shaped leaves that are about 2-4 inches long and 1/2 inch wide. The leaves are a grayish-green color and have a slightly hairy texture. The flowers of the plant are tubular and arranged in whorls around the stem. They are about 1 inch long and have two lips. The upper lip is two-lobed, while the lower lip is three-lobed. The flowers are usually blue or purple, but they can also be pink, red, or white. The plant also produces small, brownish-black seeds that are about 1/8 inch long.
Care Guide:
The Sierra beardtongue is a hardy plant that can tolerate a wide range of soil types and conditions. However, it prefers well-drained soil that is slightly acidic. The plant also requires full sun to partial shade for optimal growth. Here are some tips for caring for your Penstemon Ambiguus:
- Water: Water the plant regularly, especially during dry spells. However, make sure not to overwater the plant, as this can lead to root rot.
- Fertilization: Fertilize the plant once a month during the growing season with a balanced fertilizer.
- Soil: The plant prefers well-drained soil that is slightly acidic. If your soil is heavy and clay-like, amend it with organic matter such as compost or peat moss to improve drainage.
- Sunlight: The Sierra beardtongue requires full sun to partial shade for optimal growth. Make sure to plant it in a location that receives at least 6 hours of sunlight a day.
- Hardiness Zones: The plant is hardy in USDA zones 4-8.
Common Pests & Diseases:
The Sierra beardtongue is a relatively low-maintenance plant and is not usually prone to pests or diseases. However, here are some common issues that you may encounter:
- Aphids: These small, pear-shaped insects can suck the sap from the plant and cause stunted growth and yellowing leaves. Use insecticidal soap or neem oil to control them.
- Spider mites: These tiny, spider-like insects can cause yellowing and browning of the leaves. Use insecticidal soap or neem oil to control them.
- Root rot: Overwatering can lead to root rot, which can cause the plant to wilt and die. Make sure to water the plant only when the top inch of soil is dry.
Habitat:
The Sierra beardtongue is native to the western United States and is found in the Sierra Nevada and the Rocky Mountains. It grows in a variety of habitats, including meadows, woodlands, and rocky slopes. The plant is adapted to a range of conditions and can tolerate both drought and cold temperatures.
Question and Answer:
Q: Is the Sierra beardtongue deer-resistant?
A: Yes, the Sierra beardtongue is deer-resistant.
Q: Can Penstemon Ambiguus be grown in containers?
A: Yes, the plant can be grown in containers as long as the container is large enough to accommodate its root system.
Q: How often should I fertilize my Penstemon Ambiguus?
A: Fertilize the plant once a month during the growing season with a balanced fertilizer.
Q: Does the Sierra beardtongue attract pollinators?
A: Yes, the plant attracts bees, butterflies, and hummingbirds with its showy flowers.
Related Plants:
- Penstemon Barbatus (scarlet bugler)
- Penstemon Eatonii (firecracker penstemon)
- Penstemon Grandiflorus (large-flowered beardtongue)
- Penstemon Hartwegii (Hartweg’s penstemon)
References:
- “Penstemon ambiguus.” Missouri Botanical Garden. Accessed 5 Aug. 2021. <http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=280484&isprofile=0&=&=&=
- “Penstemon ambiguus.” Plant of the Week. Accessed 5 Aug. 2021. <https://www.fs.fed.us/wildflowers/plant-of-the-week/penstemon_ambiguus.shtml
- “Sierra Beardtongue.” High Country Gardens. Accessed 5 Aug. 2021. <https://www.highcountrygardens.com/perennial-plants/penstemon/penstemon-ambiguus
