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Description
Astragalus pycnostachyus, commonly known as the thick-spiked milk-vetch, is a species of flowering plant in the legume family Fabaceae. It is native to California, where it can be found in many habitats, including chaparral, oak woodland, and grassland. It is a perennial herb that can grow up to 1.5 m tall, with a woody base and hairy stems. The leaves are pinnately compound, with 11-21 leaflets, and the flowers are pinkish-purple and arranged in a dense, spike-like inflorescence.
Taxonomic Information
| Domain | Eukaryota |
|---|---|
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Fabales |
| Family | Fabaceae |
| Genus | Astragalus |
Appearance
The Astragalus pycnostachyus has a unique appearance, with its pinkish-purple flowers and dense, spike-like inflorescence. The leaves are pinnately compound, with 11-21 leaflets, and the stems are hairy. The plant can grow up to 1.5 m tall, with a woody base. It blooms in the spring and early summer and produces a fruit that is a pod containing seeds.
Care Guide
The Astragalus pycnostachyus is a relatively low-maintenance plant. It prefers well-draining soil and full sun to partial shade. It is drought-tolerant once established and does not require frequent watering. Fertilization is not necessary, but a light application of a balanced fertilizer in the spring can help promote growth. It is hardy in USDA zones 7-10.
Common Pests & Diseases
The Astragalus pycnostachyus is generally pest- and disease-resistant. However, it can be susceptible to root rot if the soil is too wet. It is also important to avoid overwatering, as this can lead to fungal diseases. Insects such as aphids and spider mites may occasionally infest the plant, but they can be controlled with insecticidal soap or neem oil.
Habitat
The Astragalus pycnostachyus is native to California and can be found in many habitats, including chaparral, oak woodland, and grassland. It is a hardy plant that can tolerate a range of soil types and growing conditions. It is often used in restoration projects to help stabilize soil and prevent erosion.
Question and Answer
Q: Is the Astragalus pycnostachyus a good plant for beginner gardeners?
A: Yes, the Astragalus pycnostachyus is a relatively low-maintenance plant that is easy to grow.
Q: Can the Astragalus pycnostachyus be grown in containers?
A: Yes, the Astragalus pycnostachyus can be grown in containers, but it will require regular watering and fertilization.
Q: What is the best time of year to plant the Astragalus pycnostachyus?
A: The best time to plant the Astragalus pycnostachyus is in the fall or early spring, when the soil is moist and temperatures are mild.
Q: How can I propagate the Astragalus pycnostachyus?
A: The Astragalus pycnostachyus can be propagated from seed or by division of the root ball in the fall or early spring.
Related Plants
- Astragalus lentiginosus
- Astragalus californicus
- Astragalus cicer
- Astragalus douglasii
References
- USDA Plants Database: https://plants.usda.gov/home/plantProfile?symbol=ASPY2
- CNPS Inventory of Rare and Endangered Plants: https://www.rareplants.cnps.org/Plants/Details/9
- Calflora: https://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=759
