North America Non-native Plant

Australian Bur Grass

Botanical name: Tragus australianus

USDA symbol: TRAU11

Life cycle: annual

Habit: grass

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

Australian Bur Grass: What Every Gardener Should Know About This Non-Native Grass If you’ve noticed a scrappy little grass popping up in your garden or landscape, you might be looking at Australian bur grass (Tragus australianus). This annual grass might sound exotic with its Australian roots, but it’s not exactly ...

Australian Bur Grass: What Every Gardener Should Know About This Non-Native Grass

If you’ve noticed a scrappy little grass popping up in your garden or landscape, you might be looking at Australian bur grass (Tragus australianus). This annual grass might sound exotic with its Australian roots, but it’s not exactly the kind of plant most gardeners are eager to welcome into their green spaces.

What is Australian Bur Grass?

Australian bur grass is a non-native annual grass that has made itself at home in parts of the southeastern United States, particularly South Carolina. As its name suggests, this grass originally hails from Australia, but it’s proven quite adaptable to new environments. It belongs to the grass family and has that characteristic grass-like appearance, though it’s on the smaller, more inconspicuous side of the spectrum.

Where You’ll Find It

Currently, Australian bur grass has been documented growing in South Carolina, where it reproduces on its own without any human assistance. This hardy little grass has established itself in the wild and tends to persist once it gets settled in an area.

Why Most Gardeners Skip This One

Let’s be honest – Australian bur grass isn’t winning any beauty contests. Here’s why it’s not typically on gardeners’ wish lists:

  • Limited ornamental value with small, unremarkable flowers
  • Produces bur-like seed heads that can be somewhat troublesome
  • Tends to behave like a weed rather than an attractive landscape plant
  • Offers minimal benefits to pollinators since it’s wind-pollinated
  • Not particularly useful for wildlife habitat

Growing Conditions (If You Must Know)

While we don’t generally recommend planting Australian bur grass intentionally, it’s worth understanding what conditions it thrives in – especially if you’re trying to manage it:

  • Adapts to various soil types
  • Drought tolerant once established
  • Prefers full sun locations
  • Thrives in disturbed soils and areas

Better Native Alternatives

Instead of Australian bur grass, consider these native grass options that provide much more ecological value:

  • Little bluestem for ornamental grass gardens
  • Buffalo grass for low-maintenance lawn areas
  • Native sedges for wetland or rain garden areas
  • Switchgrass for prairie-style plantings

The Bottom Line

While Australian bur grass isn’t classified as officially invasive or noxious (at least not yet), it’s certainly not a plant that most gardeners would choose to cultivate. Its weedy nature and limited aesthetic appeal make it more of a management concern than a garden asset. If you’re looking to create beautiful, ecologically valuable landscapes, you’re much better off choosing native grasses that support local wildlife and provide genuine ornamental value.

Remember, every plant we choose to grow is a vote for the kind of landscape we want to see. Why not cast your vote for native species that truly belong in your local ecosystem?

Australian Bur Grass

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

Tragus Haller - bur grass

Species

Tragus australianus S.T. Blake - Australian bur grass

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