North America Non-native Plant

Ripgut Brome

Botanical name: Bromus diandrus

USDA symbol: BRDI3

Life cycle: annual

Habit: grass

Native status: Non-native, reproduces and persists in the wild in Canada âš˜ Non-native, reproduces and persists in the wild in Hawaii âš˜ Non-native, reproduces and persists in the wild in the lower 48 states  

Ripgut Brome: What Every Gardener Should Know About This Widespread Grass If you’ve ever walked through a field or along a roadside and encountered a tall, drooping grass that seems to stick to everything, you’ve likely met ripgut brome (Bromus diandrus). This annual grass has quite the reputation, and its ...

Ripgut Brome: What Every Gardener Should Know About This Widespread Grass

If you’ve ever walked through a field or along a roadside and encountered a tall, drooping grass that seems to stick to everything, you’ve likely met ripgut brome (Bromus diandrus). This annual grass has quite the reputation, and its common name gives you a pretty good hint about why it’s not exactly beloved by hikers, pets, or livestock.

What Is Ripgut Brome?

Ripgut brome is an annual grass that originally hails from the Mediterranean region of southern Europe and North Africa. Despite its foreign origins, this adaptable plant has made itself at home across much of North America, from British Columbia down to Hawaii and coast to coast in the lower 48 states.

The plant gets its rather dramatic common name from its sharp, barbed seed heads that can literally pierce skin and cause injuries to animals and humans alike. Those seed heads aren’t just painful – they’re also incredibly effective at spreading the plant to new locations.

Where You’ll Find It

Ripgut brome has established itself across a remarkably wide range, thriving in states and provinces including Arizona, California, Colorado, Georgia, Idaho, Oregon, Texas, Washington, and many others. It’s particularly common in disturbed areas, roadsides, fields, and grasslands throughout these regions.

Should You Plant Ripgut Brome?

Here’s the straightforward answer: ripgut brome isn’t typically recommended for intentional cultivation in gardens or landscaping projects. While it’s not officially classified as invasive in all areas, this non-native grass has several characteristics that make it less than ideal for most garden situations:

  • Limited ornamental value compared to native alternatives
  • Aggressive self-seeding and spreading behavior
  • Sharp, potentially harmful seed heads
  • Can outcompete native plant species
  • Provides minimal benefits to pollinators and native wildlife

Better Native Alternatives

Instead of ripgut brome, consider these native grass alternatives that offer similar or better qualities without the drawbacks:

  • Blue grama (Bouteloua gracilis) for drought-tolerant areas
  • Buffalo grass (Poaceae dactyloides) for natural lawns
  • Little bluestem (Schizachyrium scoparium) for ornamental appeal
  • Native fescues and needlegrasses specific to your region

Growing Conditions and Characteristics

If you’re dealing with existing ripgut brome on your property, understanding its growing habits can help with management. This annual grass thrives in USDA hardiness zones 6-10 and is remarkably adaptable:

  • Prefers disturbed soils but adapts to various soil types
  • Drought tolerant once established
  • Seeds germinate primarily in fall and winter
  • Grows 1-4 feet tall with a spreading habit
  • Produces distinctive drooping seed heads in late spring/early summer

Management Tips

If ripgut brome has already established itself in your landscape, here are some management strategies:

  • Remove plants before they set seed (typically by late spring)
  • Mow or cut repeatedly to weaken the plants
  • Encourage dense plantings of desirable native species to outcompete it
  • Be cautious when handling – wear protective clothing due to sharp seed heads

The Bottom Line

While ripgut brome is certainly successful at what it does – spreading and surviving in tough conditions – it’s not the best choice for intentional garden plantings. Its aggressive nature, limited wildlife benefits, and potentially harmful seed heads make it more of a management challenge than a garden asset. Instead, focus on native grass species that provide similar resilience while supporting local ecosystems and offering better ornamental value.

Remember, the best gardens work with nature rather than against it, and choosing plants that belong in your local ecosystem is always the more sustainable path forward.

Ripgut Brome

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

Bromus L. - brome

Species

Bromus diandrus Roth - ripgut brome

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