North America Native Plant

Woody Milkvetch

Botanical name: Astragalus miser var. hylophilus

USDA symbol: ASMIH

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Woody Milkvetch: A Northwestern Native Worth Knowing If you’re exploring native plants for your garden and happen to live in the northwestern United States, you might want to get acquainted with woody milkvetch (Astragalus miser var. hylophilus). This perennial native has been quietly thriving in the American West long before ...

Woody Milkvetch: A Northwestern Native Worth Knowing

If you’re exploring native plants for your garden and happen to live in the northwestern United States, you might want to get acquainted with woody milkvetch (Astragalus miser var. hylophilus). This perennial native has been quietly thriving in the American West long before any of us started thinking about sustainable landscaping.

Where You’ll Find This Native Beauty

Woody milkvetch calls the northwestern states home, naturally occurring across Idaho, Montana, South Dakota, and Wyoming. This hardy perennial has adapted to the challenging conditions of the northern Great Plains and Rocky Mountain regions, making it a true testament to the resilience of native plants.

What Makes It Special

As a member of the legume family, woody milkvetch shares some pretty impressive traits with its cousins. Like other legumes, it likely plays an important role in soil health by potentially fixing nitrogen, though specific details about this variety’s soil benefits aren’t well-documented. What we do know is that it’s a perennial, meaning once established, it’ll return year after year – a definite plus for low-maintenance gardening enthusiasts.

The Honest Truth About Growing Information

Here’s where we need to be upfront with you: detailed growing information for this specific variety of woody milkvetch is surprisingly scarce. While we know it’s native to some pretty tough climates, specifics about ideal growing conditions, care requirements, and garden performance are largely unknown for Astragalus miser var. hylophilus.

This doesn’t mean it’s not worth considering – it just means you’ll want to do some detective work if you’re interested in adding it to your native plant collection.

Should You Plant It?

If you live within its native range, woody milkvetch could be an excellent addition to a native plant garden. Native plants offer several advantages:

  • They’re adapted to local climate conditions
  • They typically require less water and fertilizer once established
  • They support local wildlife and ecosystems
  • They help preserve regional biodiversity

However, given the limited growing information available, this might be better suited for experienced native plant gardeners or those willing to experiment and learn through observation.

Finding and Growing Woody Milkvetch

Your best bet for growing this plant successfully is to:

  • Contact local native plant societies in Idaho, Montana, South Dakota, or Wyoming
  • Reach out to regional botanical gardens or university extension services
  • Look for specialty native plant nurseries in your area
  • Connect with local naturalists who might have experience with regional milkvetch varieties

If you do manage to source this plant, observe how it grows in your specific location and consider sharing your experiences with other native plant enthusiasts – you might be contributing valuable growing information for future gardeners!

The Bottom Line

Woody milkvetch represents the kind of plant that makes native gardening both exciting and challenging. While we don’t have all the answers about growing this particular variety, its status as a regional native makes it worth investigating if you’re committed to supporting local ecosystems through your plant choices.

Sometimes the most rewarding garden adventures come from working with lesser-known natives. Just be prepared to become something of a plant detective in the process – and who knows? You might become the expert that future gardeners turn to for woody milkvetch growing advice.

Woody Milkvetch

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Fabales

Family

Fabaceae Lindl. - Pea family

Genus

Astragalus L. - milkvetch

Species

Astragalus miser Douglas ex Hook. - timber milkvetch

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA