Canada Thistle
Common name: Canada thistle

Scientific name: Cirsium arvense L. Scop.

Life Cycle: Perennial

Origin: Eurasia

Poisonous: No

Canada thistle is distributed across the northern United States and Canada. It’s listed as noxious in many states and classified as a prohibited noxious weed seed in many state seed laws.

This invasive species can grow up to 4 feet tall and is frequently found in pastures, rangeland, and along roadsides. This perennial thistle reproduces from seeds, on underground crown buds of the parent plant, and on adventitious buds on creeping roots. Purple- to rose-colored flowers form at the end of

Create a free account with to view this content. is home to thousands of free articles about horse health care. In order to access some of our exclusive free content, you must be signed into Start your free account today!

Sign UpAlready have an account?