North America Native Plant

Jaeger’s Milkvetch

Botanical name: Astragalus pachypus var. jaegeri

USDA symbol: ASPAJ

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Jaeger’s Milkvetch: A Rare California Native Worth Protecting If you’re a native plant enthusiast always on the hunt for something truly special, Jaeger’s milkvetch might just capture your imagination. This perennial California native, scientifically known as Astragalus pachypus var. jaegeri, is one of those plants that reminds us how much ...

Rare plant alert!

Region: Conservation status by state

Status: S4T1: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘

Jaeger’s Milkvetch: A Rare California Native Worth Protecting

If you’re a native plant enthusiast always on the hunt for something truly special, Jaeger’s milkvetch might just capture your imagination. This perennial California native, scientifically known as Astragalus pachypus var. jaegeri, is one of those plants that reminds us how much botanical diversity exists right in our own backyards—even if we rarely get to see it.

A True California Original

Jaeger’s milkvetch is a native species that calls California home, making it a genuine piece of the Golden State’s natural heritage. As a perennial member of the legume family, it represents the kind of specialized adaptation that makes California’s flora so fascinating and unique.

The Rarity Factor: Handle with Care

Here’s where things get serious: Jaeger’s milkvetch carries a Global Conservation Status of S4T1, which indicates this is a rare plant that deserves our respect and protection. This rarity status means that if you’re lucky enough to encounter this species, you’re looking at something truly special in the plant world.

Important consideration for gardeners: Due to its rare status, we strongly recommend that anyone interested in growing Jaeger’s milkvetch should only use responsibly sourced material from reputable native plant nurseries or conservation programs. Wild collection is never appropriate for rare species like this one.

What We Know (And What We Don’t)

Honestly, Jaeger’s milkvetch is one of those plants that keeps its secrets well. As a perennial, we know it’s built for the long haul, but specific details about its growing habits, preferred conditions, and garden performance are limited due to its rarity and specialized nature.

What we can say is that like other members of the Astragalus family, it’s likely a fascinating addition to California’s native plant community, potentially offering benefits to local pollinators and wildlife—though specific data about these relationships remains elusive.

Should You Try Growing It?

This is where we need to be realistic. Jaeger’s milkvetch isn’t your typical garden center find, and for good reason. Its rarity means:

  • It’s extremely difficult to source responsibly
  • Growing requirements are not well-documented
  • It may have very specific habitat needs that are hard to replicate in typical garden settings
  • Conservation efforts should take priority over horticultural use

Supporting Conservation Instead

Rather than trying to grow this rare beauty in your garden, consider supporting conservation efforts that protect rare California natives in their natural habitats. You can also explore other California milkvetch species that might be more readily available and better suited for home cultivation.

If you’re passionate about rare natives, connect with local botanical societies, native plant groups, or conservation organizations. They often know about legitimate propagation programs that help rare species while respecting their conservation needs.

The Bottom Line

Jaeger’s milkvetch represents the kind of botanical treasure that makes California’s native flora so remarkable. While it may not be destined for your garden bed, knowing about it connects us to the incredible diversity of plants that call our state home. Sometimes the most meaningful way to appreciate a rare plant is simply knowing it exists and supporting the efforts that keep it thriving in the wild.

For your garden, consider exploring other California native legumes that can provide similar ecological benefits while being more appropriate for cultivation. Your local native plant society can point you toward beautiful alternatives that will thrive in your specific area while supporting local wildlife.

Jaeger’s 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 pachypus Greene - thickpod milkvetch

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