Definition of Canada thistle
: a European thistle (Cirsium arvense) with pinkish-purple or white flowers naturalized as a weed in North America
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“Canada thistle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Canada%20thistle. Accessed 4 Jul. 2022.
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Time Traveler for Canada thistle
The first known use of Canada thistle was in 1799
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