description Canada Thistle Overview
Canada Thistle (Cirsium arvense), despite its common name, is native to Eurasia and is one of the most economically damaging agricultural weeds in North America, designated noxious in most U.S. states and Canadian provinces.
help Canada Thistle FAQ
Is Canada thistle native to Canada?
No. Canada thistle, Cirsium arvense, is native to Eurasia despite its common English name. It became a major introduced agricultural weed in North America.
Why is Canada thistle difficult to control?
It spreads through creeping roots as well as seeds, so pulling or cutting the visible stems may not remove the plant. Its underground root system can produce new shoots across disturbed fields.
Is Canada thistle a protected wildflower or a noxious weed?
It is designated noxious in most U.S. states and Canadian provinces. Farmers and land managers usually treat it as an invasive agricultural weed rather than a plant to encourage.
What is the scientific name of Canada thistle?
Its scientific name is Cirsium arvense. It is a perennial plant in the daisy family, Asteraceae, and commonly produces spiny leaves and purple flower heads.
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