North America Non-native Plant

Argyrolobium Uniflorum

Botanical name: Argyrolobium uniflorum

USDA symbol: ARUN5

Native status: Not native but doesn't reproduce and persist in the wild

Argyrolobium uniflorum: The Mysterious Legume That’s Puzzling Gardeners If you’ve stumbled across the name Argyrolobium uniflorum and wondered whether it deserves a spot in your garden, you’re not alone! This little-known member of the legume family has managed to stay remarkably under the radar, even among dedicated native plant enthusiasts. ...

Argyrolobium uniflorum: The Mysterious Legume That’s Puzzling Gardeners

If you’ve stumbled across the name Argyrolobium uniflorum and wondered whether it deserves a spot in your garden, you’re not alone! This little-known member of the legume family has managed to stay remarkably under the radar, even among dedicated native plant enthusiasts.

What We Know (And Don’t Know) About This Elusive Plant

Here’s where things get interesting – and a bit frustrating. Argyrolobium uniflorum belongs to the pea family (Fabaceae), which typically means it has the potential to fix nitrogen in the soil and produce charming butterfly-shaped flowers. However, specific information about this particular species is surprisingly scarce in both horticultural literature and online databases.

The genus Argyrolobium appears to have roots in southern Africa, suggesting this plant likely originates from that region. But without confirmed details about its native range, growth habits, or cultivation requirements, it’s difficult to provide definitive guidance about growing it.

The Challenge for Gardeners

Should you plant Argyrolobium uniflorum? That’s the million-dollar question! Without reliable information about:

  • Its specific growing conditions
  • USDA hardiness zones
  • Mature size and growth rate
  • Wildlife and pollinator benefits
  • Potential invasiveness

It’s challenging to make an informed recommendation. This uncertainty puts both gardeners and the plant itself in a tricky position.

A Better Path Forward

Given the limited information available about Argyrolobium uniflorum, consider exploring well-documented native legumes instead. These alternatives offer the nitrogen-fixing benefits and wildlife support you’re likely seeking, with the added bonus of reliable growing information:

  • Wild lupines (Lupinus species) for dramatic flower spikes
  • Native clovers (Trifolium species) for ground cover
  • Wild indigo (Amorpha species) for shrub borders
  • Partridge pea (Chamaecrista fasciculata) for annual color

If You’re Determined to Try It

Should you happen to acquire seeds or plants of Argyrolobium uniflorum, proceed with caution and curiosity. As a legume, it will likely prefer well-draining soil and full sun, but monitor its behavior carefully. Keep detailed records of its growth habits, flowering patterns, and any wildlife interactions – you might be contributing valuable information to the botanical community!

Most importantly, ensure any plant material comes from reputable, legal sources, and be prepared to remove it if it shows any aggressive spreading tendencies.

The Bottom Line

Argyrolobium uniflorum remains an enigma in the gardening world. While its mysterious nature might appeal to adventurous gardeners, most plant lovers will find greater success and ecological benefit with well-documented native species. Sometimes the most responsible choice is to admire a plant’s mystique from afar while nurturing those we understand better!

Argyrolobium Uniflorum

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

Argyrolobium Eckl. & Zeyh., nom. cons.

Species

Argyrolobium uniflorum (Decne.) Jaub. & Spach

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