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Canada thistle

American  

noun

  1. an Old World plant, Cirsium arvense, having small purple or white flower heads, now a troublesome weed in North America.


Canada thistle British  

noun

  1. the US and Canadian name for creeping thistle

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Canada thistle

An Americanism dating back to 1790–1800

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In 1881, Washington’s territorial government passed its first noxious weed law, to try to control the spread of Canada thistle.

From Seattle Times • Jun. 11, 2022

Canada thistle, a spindly purple-flowered weed native to southeastern Europe, likely came to North America in the 1600s in a batch of contaminated seed or in the ballast of a ship.

From Seattle Times • Jun. 11, 2022

They are targeting Johnson grass, giant foxtail, Canada thistle, nodding thistle, common teasel, multiflora rose, Amur honeysuckle, poison hemlock, marestail, Japanese knotweed and kudzu.

From Washington Times • Mar. 18, 2021

The state’s contractor, Ed’s Plant World of Brandywine, is going after porcelain-berry, kudzu, Canada thistle and mile-a-minute weed, among other species.

From Washington Post • Aug. 27, 2016

"I am not sorry for them," said Wilkinson; "they say that pest, the Canada thistle, came from the Old Country."

From Two Knapsacks A Novel of Canadian Summer Life by Campbell, John