Origin
Astragalus glabriusculus is a perennial herbaceous plant that is native to North America. It is found in the western parts of the United States, particularly in the states of California, Nevada, and Oregon.
Common names
The plant is commonly known as "Smooth-leaved milkvetch" or "Coastal milkvetch" due to the smooth texture of its leaves and its frequent occurrence along the coast.
Uses
In traditional Native American medicine, the roots of Astragalus glabriusculus were used to treat a variety of ailments, including stomach problems and respiratory issues. Additionally, some species of Astragalus have been found to have the potential to treat cancer due to their anti-inflammatory and immune-boosting properties.
Appearance
Astragalus glabriusculus has a slender stem that can grow up to 70 centimeters tall. Its leaves are made up of several pairs of leaflets that are smooth, elongated, and lance-shaped. The plant produces small purple flowers that bloom between May and July, resulting in a long, slender seedpod. The roots of the plant are long and fibrous.
Light requirements
Astragalus glabriusculus var. major prefers full sunlight or partial shade. It can tolerate some shade, but too much shade can lead to poor growth and development. Therefore, it is advisable to plant this species in locations where it can receive direct sunlight for at least 6 hours a day.
Temperature requirements
The optimal temperature range for the growth of Astragalus glabriusculus var. major is between 15°C and 30°C. This plant species can tolerate temperatures as low as -5°C and as high as 40°C, but extreme temperatures can affect its growth and development. It is important to note that the plant has a dormant period during the winter season, where it can withstand colder temperatures.
Soil requirements
This plant species can grow in a variety of soils, including clay soils, sandy soils, and loamy soils. However, it prefers well-drained soils that have a neutral to slightly alkaline pH (between 6.0 and 7.5). It can tolerate mildly acidic soils (pH 5.5), but extremely acidic or waterlogged soils can negatively affect its growth and development. To enhance growth, it is recommended to add organic matter when planting, which helps to improve soil structure and nutrient content.
Cultivation
Astragalus glabriusculus (Hook.) Gray var. major Gray is a hardy perennial plant that grows well in full to partial sunlight. It requires a well-drained, sandy loam soil with a pH of 6.0-7.5. The plant can be propagated from seed or cuttings. When planting from seed, it is advisable to scarify the hard seed coat to improve germination rates.
Watering needs
The plant requires moderate watering during the growing season. Overwatering can lead to root rot and stunted growth, while under-watering can cause wilting. Watering should be done early in the day, to allow the foliage to dry off by evening and minimize the risk of fungal diseases. Once the plant is established, it can tolerate short periods of drought.
Fertilization
Astragalus glabriusculus (Hook.) Gray var. major Gray is a legume that can fix nitrogen from the atmosphere. However, to enhance growth and vigor, it is recommended to fertilize the plant with a balanced fertilizer, such as a 10-10-10 or 20-20-20 NPK fertilizer, applied at a rate of 1 pound per 100 square feet in early spring or after the first flush of growth.
Pruning
Astragalus glabriusculus (Hook.) Gray var. major Gray requires minimal pruning. Deadheading spent flowers can promote the development of new flowers and prevent the plant from self-seeding. If the plant becomes too leggy and sprawling, it can be pruned back to about 6 inches in early spring to promote new growth and a more compact form.
Propagation of Astragalus glabriusculus (Hook.) Gray var. major Gray
Astragalus glabriusculus (Hook.) Gray var. major Gray, commonly known as Smooth Yellow Sweetclover, is a summer annual legume that is indigenous to North America and is noted for its high yield potential and forage quality.
Seed Propagation
The most common method of propagating Astragalus glabriusculus is through seed propagation. Seeds should be sowed in a well-drained and fertile soil mixture. The ideal temperature for germination is 60-65°F, and seeds should be planted at a depth of 1/4 inch to 1/2 inch. The seedlings should be thinned to a spacing of 4-6 inches, and proper moisture conditions should be maintained.
Cutting Propagation
Cutting propagation is another method of propagating Astragalus glabriusculus. This is done by taking cuttings from an established plant, inserting them into soil, and providing the proper growing conditions. Cuttings should be taken in the spring or early summer when the plant is actively growing. They should be planted in a well-draining soil mix, and kept moist. The cuttings will eventually root, and new growth will appear.
Disease and Pest Management of Astragalus glabriusculus (Hook.) Gray var. major Gray
Astragalus glabriusculus (Hook.) Gray var. major Gray, commonly known as the Denver milkvetch, is a beautiful plant that can be found in the western part of North America. While the plant is relatively drought-tolerant and can thrive in a variety of soils, it is still susceptible to several diseases and pests that can harm its growth and development. Here are some of the common diseases and pests that affect Astragalus glabriusculus and how to manage them.
Leaf Spot Diseases
Leaf spot diseases are a common issue for Astragalus glabriusculus. Symptoms include small, dark spots on the leaves that can merge together and create large dead patches. These diseases are caused by various fungi and bacteria and can usually be controlled with fungicides or by removing the infected leaves. It is important to identify the specific pathogen causing the leaf spots to make sure the right treatment approach is used.
Root Rot
Root rot is caused by waterlogging in the soil, which creates an environment for fungi to thrive. Symptoms of root rot include yellowing leaves, wilting, and stunted growth. Preventing root rot is the best strategy, which can be done by ensuring proper soil drainage and moderate watering. Fungicides can also be used as a treatment, but it's essential to catch the disease early to save the plant.
Spider Mites
Aphids, spider mites, and other pests can damage the growth and development of Astragalus glabriusculus. Spider mites are especially common and can cause yellowed, stippled leaves. You can get rid of spider mites by washing the plants with a strong stream of water or by using insecticidal soap. Additionally, removing any heavily infested leaves or plants can help control the problem.
Cutworms
Cutworms are another common pest that can harm the plant's growth. The larvae of various species of moths can cause damage by cutting the plants at the base of the stem. One of the best methods to protect the plant from cutworms is to form a collar around the base of the stems by placing cardboard or plastic around the seedlings.
By taking these steps and keeping a close eye on your Astragalus glabriusculus (Hook.) Gray var. major Gray, you can keep your plant healthy and vibrant for years to come.
