North America Native Plant

Fernald’s Milkvetch

Botanical name: Astragalus robbinsii var. fernaldii

USDA symbol: ASROF

Life cycle: perennial

Habit: forb

Native status: Native to Canada  

Synonyms: Astragalus eucosmus B.L. Rob. var. fernaldii (Rydb.) B. Boivin (ASEUF2)  âš˜  Astragalus fernaldii (Rydb.) H.F. Lewis (ASFE7)   

Fernald’s Milkvetch: A Rare Canadian Native Worth Knowing About If you’ve stumbled across the name Fernald’s milkvetch (Astragalus robbinsii var. fernaldii), you’ve discovered one of Canada’s most elusive native plants. Also known as Fernald’s milk-vetch, this perennial species represents a fascinating piece of North American botanical heritage – though it’s ...

Rare plant alert!

Region: Conservation status by state

Status: S5T1: 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) ⚘ 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. ⚘

Fernald’s Milkvetch: A Rare Canadian Native Worth Knowing About

If you’ve stumbled across the name Fernald’s milkvetch (Astragalus robbinsii var. fernaldii), you’ve discovered one of Canada’s most elusive native plants. Also known as Fernald’s milk-vetch, this perennial species represents a fascinating piece of North American botanical heritage – though it’s not one you’re likely to encounter in your local garden center anytime soon.

Where Does Fernald’s Milkvetch Call Home?

This rare native plant makes its home exclusively in eastern Canada, specifically in Quebec, Labrador, and Newfoundland. It’s a true northerner, adapted to the unique conditions of Canada’s eastern provinces and territories.

The Rarity Factor: Why This Plant is Special

Here’s where things get serious: Fernald’s milkvetch carries a Global Conservation Status of S5T1, which indicates this plant is extremely rare. This isn’t your typical garden variety perennial – we’re talking about a species that exists in very limited numbers in very specific locations.

What does this mean for gardeners? Simply put, this isn’t a plant you should be looking to add to your landscape design. Its rarity status means it needs protection in its natural habitat rather than cultivation in home gardens.

A Plant Shrouded in Mystery

Due to its extreme rarity, much about Fernald’s milkvetch remains unknown to the gardening world. Details about its:

  • Specific growing requirements
  • Mature size and growth habit
  • Pollinator relationships
  • Propagation methods
  • Garden suitability

are simply not well-documented in horticultural literature. This lack of information isn’t unusual for plants that exist in such small populations and restricted ranges.

What About Alternatives?

If you’re interested in supporting native Canadian plants in your garden, there are many other members of the Astragalus family (milkvetches) that are more readily available and better suited for cultivation. Consider researching other native legumes that can provide similar ecological benefits without the conservation concerns.

The Bottom Line for Gardeners

While Fernald’s milkvetch is undoubtedly a fascinating native species, it’s not one for the home garden. Its extreme rarity means it’s best left to conservation efforts and protected natural areas. As responsible gardeners, our role is to appreciate and protect such rare species by choosing more common natives for our landscapes.

If you’re passionate about rare plant conservation, consider supporting organizations that work to protect Canada’s native plant heritage – that’s where species like Fernald’s milkvetch will truly benefit from our attention and care.

Fernald’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 robbinsii (Oakes) A. Gray - Robbins' milkvetch

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