North America Non-native Plant

Hordeum Comosum

Botanical name: Hordeum comosum

USDA symbol: HOCO4

Habit: grass

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

Hordeum comosum: A Botanical Mystery Worth Exploring If you’ve stumbled across the name Hordeum comosum in your botanical wanderings, you’re likely wondering what exactly this mysterious grass is all about. Well, grab a cup of tea because we’re about to dive into one of those delightfully obscure plant species that ...

Hordeum comosum: A Botanical Mystery Worth Exploring

If you’ve stumbled across the name Hordeum comosum in your botanical wanderings, you’re likely wondering what exactly this mysterious grass is all about. Well, grab a cup of tea because we’re about to dive into one of those delightfully obscure plant species that keeps botanists on their toes!

What Exactly Is Hordeum comosum?

Hordeum comosum belongs to the grass family (Poaceae) and is related to the more familiar barley species. As a monocot, it shares characteristics with other grasses, sedges, and grass-like plants. Think of it as a distant cousin to the barley in your breakfast bowl, but with its own unique personality.

Unfortunately, this particular species doesn’t seem to have earned itself a widely recognized common name, which tells us something important: it’s not exactly a household favorite in the gardening world.

Where Does It Call Home?

From what we can gather, Hordeum comosum appears to have Mediterranean origins, likely native to southern European regions. Like many Mediterranean plants, it has probably evolved to handle hot, dry summers and mild winters.

The Reality Check: Why You Probably Won’t Find This at Your Local Nursery

Here’s where things get interesting (and perhaps a bit disappointing for plant collectors): Hordeum comosum isn’t commonly cultivated or readily available in the horticultural trade. This isn’t necessarily because it’s a bad plant, but rather because:

  • Limited ornamental appeal compared to other decorative grasses
  • Specialized growing requirements that aren’t well-documented
  • Lack of commercial interest or breeding programs
  • Minimal landscape applications in typical garden settings

For the Botanical Enthusiasts

If you’re the type of gardener who gets excited about botanical rarities and scientific collections, Hordeum comosum might pique your interest. However, you’ll need to:

  • Source seeds or plants from specialized botanical suppliers
  • Experiment with Mediterranean-style growing conditions
  • Be prepared for limited information about care requirements
  • Consider it more of a research project than a reliable garden staple

Better Alternatives for Your Garden

If you’re drawn to ornamental grasses with a Mediterranean flair, consider these well-established alternatives that offer better garden performance:

  • Fountain grass (Pennisetum species) for dramatic texture
  • Feather reed grass (Calamagrostis x acutiflora) for vertical interest
  • Native bunch grasses specific to your region
  • Little bluestem (Schizachyrium scoparium) if you’re in North America

The Bottom Line

Hordeum comosum represents one of those fascinating botanical footnotes that remind us how much diversity exists in the plant kingdom. While it might not be the star of your next landscape project, it serves as a reminder that sometimes the most interesting plants are the ones that remain mysteriously elusive.

For most gardeners, this species falls into the interesting to know about but not practical to grow category. If you’re building a Mediterranean garden or working on a botanical collection, it might be worth investigating further. Otherwise, there are plenty of spectacular and well-documented ornamental grasses that will give you more bang for your gardening buck!

Hordeum Comosum

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

Hordeum L. - barley

Species

Hordeum comosum J. Presl

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