North America Non-native Plant

Onobrychis Melanotricha

Botanical name: Onobrychis melanotricha

USDA symbol: ONME3

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

Onobrychis melanotricha: A Mysterious Member of the Sainfoin Family If you’ve stumbled across the name Onobrychis melanotricha in your plant research, you’re likely wondering what exactly this species is and whether it belongs in your garden. Well, you’re not alone in your curiosity! This particular member of the sainfoin family ...

Onobrychis melanotricha: A Mysterious Member of the Sainfoin Family

If you’ve stumbled across the name Onobrychis melanotricha in your plant research, you’re likely wondering what exactly this species is and whether it belongs in your garden. Well, you’re not alone in your curiosity! This particular member of the sainfoin family is one of those botanical mysteries that keeps plant enthusiasts scratching their heads.

What We Know About This Elusive Plant

Onobrychis melanotricha belongs to the legume family, making it a cousin to more familiar plants like beans, peas, and other sainfoins. The genus Onobrychis is known for producing plants that are generally beneficial to pollinators and soil health, thanks to their nitrogen-fixing abilities. However, this particular species seems to fly under the radar in most gardening and botanical literature.

The Challenge of Limited Information

Here’s where things get tricky for us garden enthusiasts. Unlike its more famous relatives in the sainfoin family, Onobrychis melanotricha doesn’t have a wealth of growing guides, care sheets, or even basic information readily available. We don’t have clear data on:

  • Its native range or geographic distribution
  • Preferred growing conditions
  • USDA hardiness zones
  • Mature size and growth habits
  • Specific pollinator relationships
  • Whether it’s considered rare, invasive, or simply uncommon

Should You Grow It?

Given the lack of comprehensive information about Onobrychis melanotricha, it’s difficult to provide confident growing recommendations. If you’re considering this plant for your garden, you might want to ask yourself a few questions:

  • Do you have access to seeds or plants from a reputable source?
  • Are you prepared for some gardening experimentation?
  • Would you be comfortable with uncertain outcomes?

Consider Well-Documented Alternatives

If you’re drawn to the sainfoin family for your garden, you might have better luck with more established species like Onobrychis viciifolia (Common Sainfoin), which has proven benefits for pollinators and is well-documented in terms of growing requirements. Native legumes in your area could also provide similar ecological benefits with the added advantage of being perfectly suited to your local conditions.

The Bottom Line

Onobrychis melanotricha remains something of an enigma in the gardening world. While the mystery might appeal to adventurous gardeners who enjoy trying unusual species, most of us are probably better served by choosing plants with established track records and clear growing guidelines.

If you’re passionate about expanding botanical knowledge and don’t mind being a garden guinea pig, this could be an interesting species to explore. Just be prepared to do some detective work and possibly contribute to our understanding of this lesser-known plant!

Have you encountered Onobrychis melanotricha in your gardening adventures? We’d love to hear about your experiences with this mysterious sainfoin in the comments below!

Onobrychis Melanotricha

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

Onobrychis Mill. - sainfoin

Species

Onobrychis melanotricha Boiss.

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