North America Non-native Plant

Tick Quackgrass

Botanical name: Thinopyrum pycnanthum

USDA symbol: THPY4

Life cycle: perennial

Habit: grass

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

Synonyms: Agropyron campestre Gren. & Godr. (AGCA13)  ⚘  Agropyron littorale auct. non (Host) Durand (AGLI81)  ⚘  Agropyron pungens auct. non (Pers.) Roem. & Schult. (AGPU3)  ⚘  Agropyron pungens (Pers.) Roem. & Schult. var. acadiense (F.T. Hubbard) Fernald (AGPUA)  ⚘  Agropyron pycnanthum (Godr.) Gren. & Godr. (AGPY80)  ⚘  Elytrigia pungens auct. non (Pers.) Tutin (ELPU3)  ⚘  Elymus pungens auct. non (Pers.) Melderis (ELPU4)  ⚘  Elytrigia pycnanthes (Godr.) Á. Löve, orth. var. (ELPY2)  ⚘  Elytrigia pycnantha (Godr.) Á. Löve (ELPY3)  ⚘  Elymus pycnanthus (Godr.) Melderis (ELPY80)  ⚘  Triticum pungens auct. non Pers. (TRPU12)   

Tick Quackgrass: What Every Gardener Should Know About This Non-Native Grass If you’ve stumbled across the name tick quackgrass in your plant research, you might be wondering what this somewhat oddly-named grass is all about. Scientifically known as Thinopyrum pycnanthum, this perennial grass has an interesting story that every native ...

Tick Quackgrass: What Every Gardener Should Know About This Non-Native Grass

If you’ve stumbled across the name tick quackgrass in your plant research, you might be wondering what this somewhat oddly-named grass is all about. Scientifically known as Thinopyrum pycnanthum, this perennial grass has an interesting story that every native plant enthusiast should know.

What is Tick Quackgrass?

Tick quackgrass is a perennial graminoid – that’s botanist-speak for a grass or grass-like plant. Like other members of the grass family, it’s a monocot with the characteristic narrow leaves and fibrous root system you’d expect. However, there’s an important detail that sets this species apart from many of our beloved native grasses.

The Non-Native Reality

Here’s where things get interesting (and a bit concerning): tick quackgrass isn’t actually native to North America. This European transplant has established itself across various regions and now reproduces on its own in the wild without any human help. It’s what botanists call a naturalized species – essentially, it’s made itself at home whether we invited it or not.

Where You’ll Find It

Tick quackgrass has spread across a surprisingly wide range of North American locations. You can find established populations in:

  • Canadian provinces: Alberta and Nova Scotia
  • Northeastern states: Maine, Massachusetts, New Hampshire, New York, Pennsylvania, Rhode Island
  • Western states: Oregon, Washington
  • As far south as Texas

Wetland Connections

One notable characteristic of tick quackgrass is its relationship with wet areas. Across all regions where it’s found, this grass has a Facultative Wetland status. In plain English, this means it usually hangs out in wetlands but isn’t picky enough to avoid drier spots when the opportunity arises. This flexibility might help explain how it’s managed to establish itself across such diverse geographic areas.

Should You Plant It?

Here’s where we need to have an honest conversation. While tick quackgrass isn’t currently listed as invasive or noxious (at least in available databases), its non-native status gives us pause. As native plant advocates, we believe there are compelling reasons to look toward our homegrown alternatives instead.

The truth is, there’s limited information available about this species’ garden performance, care requirements, or ecological benefits. When you’re investing time and energy into your landscape, why not choose plants with proven track records that also support local ecosystems?

Better Native Alternatives

Instead of tick quackgrass, consider these fantastic native grass options that will give you beauty and ecological benefits:

  • For wetland areas: Try native sedges like fox sedge or bladder sedge
  • For prairie-style plantings: Little bluestem and buffalo grass are stunners
  • For coastal areas: Beach grass species native to your region
  • For general landscaping: Native fescues and bunch grasses

The Bottom Line

While tick quackgrass might not be the villain of the plant world, it’s not exactly the hero of your native garden story either. With so many gorgeous native grasses available that support local wildlife, improve soil health, and provide stunning seasonal interest, there’s really no compelling reason to choose this European import.

If you’re passionate about creating landscapes that support local ecosystems while looking absolutely gorgeous, stick with the natives. Your local birds, butterflies, and beneficial insects will thank you, and you’ll have the satisfaction of knowing your garden is truly working in harmony with its environment.

Remember, every plant choice is a vote for the kind of landscape – and world – we want to create. Why not cast your vote for the home team?

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Atlantic and Gulf Coastal Plain

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Eastern Mountains and Piedmont

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Northcentral & Northeast

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Western Mountains, Valleys, and Coast

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Tick Quackgrass

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

Thinopyrum Á. Löve - wheatgrass

Species

Thinopyrum pycnanthum (Godr.) Barkworth - tick quackgrass

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