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Invasive Plants in Northern Virginia: Canada Thistle
Cirsium arvense, (Canada thistle), a native of southeastern Europe and the Mediterranean, was brought to North America in early 1700s, probably as a contaminant of crop seed. By the end of the century is was already recognized as a noxious weed in crops, and it is now recognized as invasive in open natural areas, such as fields, meadows, wet prairies, and even inhospitable sand dunes, through most of the United States. Continue reading