Small-flowered milkvetch (Astragalus nuttallianus)

Also known as: Nuttall milkvetch

The plant you're describing is likely **Small-flowered Milkvetch** (*Astragalus nuttallianus*). This annual herb features hairy stems and attractive, bi-colored white and purple flowers. It is indigenous to the southern regions of the United States and typically flourishes in dry environments.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Small-flowered milkvetch

Lifespan

Annual, Perennial

Plant Type

Herb

Plant Height

4 cm to 45 cm

Spread

N/A

Leaf Color

Green

Flower Size

4 mm to 6 mm

Flower Color

White Purple

Images of Small-flowered milkvetch

Quickly Identify Small-flowered milkvetch

Astragalus nuttallianus can be identified by its small, compound leaves with numerous tiny leaflets, its small, pink to purple pea-like flowers, and its slender, often curved seed pods.

Scientific Classification of Small-flowered milkvetch

Phylum

Vascular plants

Class

Dicotyledons

Order

Fabales

Family

Legume

Genus

Milkvetch

Species

Small-flowered milkvetch

Planting and Growing of Small-flowered milkvetch

Care Difficulty

Easy

Watering Schedule

Every 2 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Small-flowered milkvetch?

Astragalus nuttallianus generally requires about 250 milliliters of water per watering session. The key principle is ensuring the soil is moist but not waterlogged, allowing for adequate drainage while keeping the roots hydrated.

What are the symptoms of an underwatered Small-flowered milkvetch? ›

What should I do if my Small-flowered milkvetch is not getting enough water? ›

What are the symptoms of an overwatered Small-flowered milkvetch? ›

How to save an overwatered Small-flowered milkvetch? ›

What Are the Sunlight Requirements for Small-flowered milkvetch?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 5-7 hours daily

Half day to full day sun ensures healthy growth for Astragalus nuttallianus. Ideal light levels encourage robust foliage development, enhance blooming potential, and support overall plant strength against environmental stressors.

Optimal Sunlight Exposure ›

Protection from Harsh Light ›

Monitoring Light Changes ›

What Is the Ideal Temperature Range for Small-flowered milkvetch?

Ideal Temperature: 60 ~ 75℉

For optimal growth, Astragalus nuttallianus thrives in a temperature range of 60 °F to 75 °F. This range supports crucial physiological processes such as photosynthesis, respiration, and nutrient uptake. Maintaining this temperature ensures robust growth and enhances the plant's resilience to biotic stressors. It is recommended to control the microclimate within this range to facilitate consistent growth patterns, especially during critical stages of development such as germination and flowering.

What Soil is Best for Small-flowered milkvetch?

Soil type: Sandy soil, Sandy loam

Soil PH: 6.5 ~ 7.5

Astragalus nuttallianus thrives best in well-draining soils. Proper drainage prevents root rot by allowing excess water to move away quickly. This enhances root oxygenation and supports robust plant growth. This plant benefits from soils with a moderate level of nutrients. Overly fertile soils can lead to excessive foliage at the expense of flowers. Balanced nutrition supports both flowering and growth. Preferring a soil pH of 6.5 to 7.5, Astragalus nuttallianus grows well in neutral to slightly alkaline conditions. This pH range optimizes nutrient availability and uptake for the plant.

How to Fertilize Small-flowered milkvetch?

Fertilizer type: Balanced

Astragalus nuttallianus thrives with modest fertilization. For liquid fertilizers, use a balanced 10-10-10 formula, diluted to half strength. Apply approximately one tablespoon of this diluted solution per plant each time. Ensure that the soil is slightly moist before fertilizing to prevent root burn.

How to Prune Small-flowered milkvetch?

Pruning Time: Spring, Summer, Autumn

Walk around the plant and look for dead or damaged stems and leaves. Carefully cut these parts off at the base to encourage new growth and prevent disease. Astragalus nuttallianus can grow quite unruly. Trim back the excess growth to maintain a pleasing, manageable shape, promoting a healthier and more aesthetically appealing plant. Ensure that the center of the plant is open enough to allow for good airflow. This reduces mold risk and ensures each part of the plant gets necessary light exposure. More About Pruning Techniques→

How to Propagate Small-flowered milkvetch plant?

Propagate Time: Spring, Early spring

Begin by filling a seed starting tray with a well-draining seed starting mix. Sow the seeds on the surface and lightly cover them with a thin layer of soil.

Gently water the seeds or cuttings using a spray bottle to avoid washing them away. Keep the soil consistently moist but not waterlogged.

For root cuttings, select a healthy parent plant. Carefully extract a portion of the root system, ensuring to take thick, healthy roots for better propagation success.

How to Repot Small-flowered milkvetch plant?

Repotting frequency: Annually or biennially

Repot Astragalus nuttallianus when you notice roots circling the pot's base or emerging from drainage holes. Another signal is slowed growth stage, indicating that nutrients may be exhausted. Early spring to late summer are optimal times as it's active in these months.

Select a pot that's 1 to 2 inches larger in diameter than the current one, with ample drainage holes. Ensure it’s made of breathable material like terracotta, which prevents root rot by allowing air circulation and moisture drainage.

Opt for well-draining sandy soil, rich in organic matter, mimicking its natural habitat. This type of soil prevents waterlogging, ensuring aeration and proper root development, thus promoting healthy growth.