North America Non-native Plant

Phleum Hirsutum

Botanical name: Phleum hirsutum

USDA symbol: PHHI18

Habit: grass

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

Synonyms: Phleum michelii All. (PHMI18)   

Phleum hirsutum: The Mystery Grass You’ve Probably Never Heard Of If you’re scratching your head wondering what Phleum hirsutum is, you’re not alone! This obscure grass species is one of those botanical mysteries that even seasoned gardeners and plant enthusiasts rarely encounter. Sometimes referred to by its synonym Phleum michelii, ...

Phleum hirsutum: The Mystery Grass You’ve Probably Never Heard Of

If you’re scratching your head wondering what Phleum hirsutum is, you’re not alone! This obscure grass species is one of those botanical mysteries that even seasoned gardeners and plant enthusiasts rarely encounter. Sometimes referred to by its synonym Phleum michelii, this grass belongs to the Poaceae family—the same family that brings us familiar lawn grasses and ornamental varieties.

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

Here’s where things get interesting—and by interesting, I mean frustratingly vague. Phleum hirsutum appears to be of European origin, but specific details about its native range, growing habits, and characteristics are surprisingly scarce in both horticultural and botanical literature. This isn’t your typical garden center find!

The Great Information Gap

As someone who loves diving deep into plant profiles, I have to be honest with you: reliable information about Phleum hirsutum is practically non-existent. We don’t have clear data on:

  • Its specific growing conditions and requirements
  • USDA hardiness zones where it thrives
  • Its mature size and growth rate
  • Whether it has any ornamental value
  • Its invasive potential or conservation status
  • Specific wildlife or pollinator benefits

Should You Try to Grow It?

Given the lack of available information, growing Phleum hirsutum would be more of an experimental adventure than a reliable gardening choice. Without knowing its growing requirements, potential invasiveness, or even where to source it, this grass presents more questions than answers for the home gardener.

Better Alternatives for Your Garden

Instead of chasing this botanical unicorn, why not consider some well-documented native grasses that will actually thrive in your garden? Depending on your region, you might explore:

  • Native bunch grasses that provide structure and movement
  • Ornamental grasses with proven garden performance
  • Locally adapted species that support wildlife and pollinators

The Bottom Line

While Phleum hirsutum might sound intriguing to plant collectors and botanical enthusiasts, the lack of available information makes it an impractical choice for most gardeners. Sometimes the most responsible approach is to stick with plants we understand well—especially when it comes to introducing species to our landscapes.

If you’re drawn to unique grasses, I’d encourage you to explore the wonderful world of well-documented native species in your area. Your local extension office or native plant society can point you toward grasses that will not only grow successfully but also contribute meaningfully to your local ecosystem.

After all, the best garden plants are the ones that thrive, not the ones that leave us guessing!

Phleum Hirsutum

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

Phleum L. - timothy

Species

Phleum hirsutum Honck.

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