North America Native Plant

Naked Milkvetch

Botanical name: Astragalus serenoi

USDA symbol: ASSE4

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Naked Milkvetch: A Rare Native Gem for California and Nevada Gardens Meet the naked milkvetch (Astragalus serenoi), one of nature’s more elusive wildflowers that calls the American Southwest home. This perennial native might not be the showiest plant in your garden center, but for those lucky enough to encounter it, ...

Naked Milkvetch: A Rare Native Gem for California and Nevada Gardens

Meet the naked milkvetch (Astragalus serenoi), one of nature’s more elusive wildflowers that calls the American Southwest home. This perennial native might not be the showiest plant in your garden center, but for those lucky enough to encounter it, this little legume offers a unique glimpse into the diverse world of native milkvetches.

Where You’ll Find Naked Milkvetch

Naked milkvetch is a true regional native, naturally occurring only in California and Nevada. This limited distribution makes it a special addition for gardeners in these states who want to showcase truly local flora. As a plant native to the lower 48 states, it has evolved specifically to thrive in the unique conditions of the southwestern United States.

What Makes It Special

As a member of the Astragalus genus, naked milkvetch belongs to a fascinating group of legumes known for their ability to fix nitrogen in the soil. This perennial wildflower, while not commonly found in cultivation, represents an important part of the native plant community in its natural range.

Should You Grow Naked Milkvetch?

Here’s where things get interesting – and a bit challenging. While naked milkvetch would make a wonderful addition to native plant gardens, it’s extremely difficult to find in the nursery trade. This rarity in cultivation means most gardeners won’t have the opportunity to grow it, despite its native credentials.

If You’re Lucky Enough to Find It

Should you stumble upon naked milkvetch at a specialized native plant sale or through a rare plant society, here’s what you should know:

  • It’s a perennial, so once established, it should return year after year
  • Like most milkvetches, it likely prefers well-draining soils and can handle drought conditions
  • It would fit beautifully in a native wildflower garden or naturalized landscape
  • As a legume, it may actually improve your soil by adding nitrogen

Growing Challenges and Alternatives

The biggest challenge with naked milkvetch isn’t growing it – it’s finding it. The lack of available information about its specific growing requirements reflects how rarely it’s cultivated. If you’re interested in milkvetches for your California or Nevada garden, consider looking for other Astragalus species that are more readily available from native plant nurseries.

The Bottom Line

Naked milkvetch represents one of those holy grail plants for native plant enthusiasts – wonderful in theory, but practically impossible to obtain. While we can’t recommend specific growing tips due to limited cultivation experience, we can appreciate this plant for what it represents: the incredible diversity of native flora that exists in our landscapes, even if we can’t always bring it home to our gardens.

If native legumes appeal to you, work with your local native plant society or extension office to discover which Astragalus species are available in your area. You might not get naked milkvetch, but you’ll likely find something equally fascinating that’s much easier to grow and enjoy.

Naked 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 serenoi (Kuntze) Sheldon - naked milkvetch

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