North America Non-native Plant

Trisetum Latifolium

Botanical name: Trisetum latifolium

USDA symbol: TRLA31

Habit: grass

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

The Mystery of Trisetum latifolium: A Grass That’s Hard to Pin Down If you’ve stumbled across the name Trisetum latifolium in your plant research, you’ve discovered one of botany’s little mysteries. This grass species sits in that frustrating category of plants that seem to exist in name but remain elusive ...

The Mystery of Trisetum latifolium: A Grass That’s Hard to Pin Down

If you’ve stumbled across the name Trisetum latifolium in your plant research, you’ve discovered one of botany’s little mysteries. This grass species sits in that frustrating category of plants that seem to exist in name but remain elusive when you’re trying to learn more about them.

What We Know (And Don’t Know)

Trisetum latifolium belongs to the grass family and falls under the broader category of graminoids – those grass-like plants that include true grasses, sedges, and rushes. The genus Trisetum typically includes what are commonly called oatgrasses, but beyond that basic classification, reliable information about this particular species becomes surprisingly scarce.

Here’s what makes this plant puzzling: while the name appears in some botanical references, detailed information about its characteristics, native range, and growing requirements is either missing or contradictory across different sources.

The Challenge of Mysterious Plants

Sometimes in the plant world, you’ll encounter species names that seem to float in a gray area of botanical classification. This could happen for several reasons:

  • The name might be an old synonym that’s no longer widely accepted
  • It could be a regional or local variant with limited distribution
  • The plant might be extremely rare or possibly extinct
  • There could be confusion with similar species in the same genus

What This Means for Gardeners

If you’re hoping to add Trisetum latifolium to your garden, you’ll face some practical challenges. Without clear information about its growing requirements, hardiness zones, or even its appearance, it’s nearly impossible to provide reliable growing advice.

More importantly, if you can’t find this plant available from reputable native plant nurseries or seed suppliers, that’s often a red flag that the species might not be what it appears to be in catalogs or online listings.

Better Alternatives to Consider

Instead of chasing this botanical ghost, consider these well-documented native grass alternatives that might give you similar garden benefits:

  • Other Trisetum species that are well-established and available
  • Native bunch grasses appropriate for your region
  • Ornamental grasses with known wildlife benefits

The Takeaway

Sometimes the most honest answer about a plant is we don’t know enough about it. Trisetum latifolium appears to be one of those cases where the name exists, but the practical information gardeners need simply isn’t available or reliable.

When you encounter mysterious plants like this, it’s usually better to focus your gardening energy on well-documented native species that you can successfully grow and that will provide known benefits to local wildlife. After all, a thriving garden full of plants you understand is far more rewarding than struggling with botanical question marks.

Trisetum Latifolium

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Poaceae Barnhart - Grass family

Genus

Trisetum Pers. - oatgrass

Species

Trisetum latifolium Hitchc. [excluded]

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