North America Native Plant

Fairfield Milkvetch

Botanical name: Astragalus atratus var. inseptus

USDA symbol: ASATI

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Fairfield Milkvetch: Idaho’s Lesser-Known Native Gem If you’re a native plant enthusiast looking for something truly unique for your Idaho garden, you might want to consider Fairfield milkvetch (Astragalus atratus var. inseptus). This perennial native is one of those under-the-radar plants that doesn’t get much attention in gardening circles, but ...

Rare plant alert!

Region: Conservation status by state

Status: S4S5T3: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ 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 ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Fairfield Milkvetch: Idaho’s Lesser-Known Native Gem

If you’re a native plant enthusiast looking for something truly unique for your Idaho garden, you might want to consider Fairfield milkvetch (Astragalus atratus var. inseptus). This perennial native is one of those under-the-radar plants that doesn’t get much attention in gardening circles, but that’s precisely what makes it intriguing for adventurous gardeners who want to support local ecosystems.

What Makes Fairfield Milkvetch Special?

Fairfield milkvetch is a native perennial that belongs to the diverse Astragalus genus, commonly known as milkvetches or locoweeds. As a true Idaho native, this plant has evolved specifically to thrive in the unique conditions of the Gem State, making it an excellent choice for gardeners interested in authentic regional landscaping.

Where You’ll Find This Native

This milkvetch variety calls Idaho home and is found naturally within the state’s diverse ecosystems. As a plant native to the lower 48 states with such a specific geographic range, Fairfield milkvetch represents the kind of local flora that gives each region its distinctive character.

The Challenge of Growing a Rare Native

Here’s where things get interesting – and a bit challenging. Fairfield milkvetch isn’t your typical garden center find. With limited documentation and what appears to be a restricted natural range, this plant falls into the category of species that require extra care and consideration.

If you’re determined to grow this native beauty, here are some important considerations:

  • Source responsibly: Only obtain plants or seeds from reputable native plant sources
  • Respect wild populations: Never harvest from wild stands
  • Consider alternatives: Other Astragalus species might be more readily available and easier to establish

Growing Conditions and Care

While specific growing information for this variety is limited, most milkvetches share certain preferences that can guide your gardening efforts:

  • Well-draining soil is typically essential for milkvetch species
  • Full sun exposure is generally preferred
  • As a native perennial, it should be adapted to Idaho’s climate conditions
  • Minimal water requirements once established, fitting Idaho’s often dry conditions

Why Consider This Native Plant?

Despite the challenges, there are compelling reasons to be interested in Fairfield milkvetch:

  • Supporting local biodiversity by growing true regional natives
  • Contributing to conservation efforts for lesser-known species
  • Creating authentic Idaho landscapes that reflect natural plant communities
  • Potential wildlife benefits, as milkvetches often support specialized pollinators and other insects

A Word of Caution and Encouragement

Growing rare or uncommon native plants like Fairfield milkvetch requires patience, research, and responsibility. If you’re new to native gardening, you might want to start with more common Idaho natives before tackling this challenging species.

However, if you’re an experienced native plant gardener looking for a unique addition to your collection, and you can source this plant responsibly, Fairfield milkvetch could be a rewarding addition to a specialized native plant garden or naturalized landscape.

Remember, the goal of native plant gardening is to support local ecosystems while creating beautiful, sustainable landscapes. Whether you choose Fairfield milkvetch or other Idaho natives, you’re contributing to something bigger than just your garden – you’re helping preserve the natural heritage of your region.

Fairfield 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 atratus S. Watson - mourning milkvetch

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