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The Canada Thistle has been on the continent since the 17th century, and is identified as an invasive species. In Ontario, it is considered a noxious weed. It will grow almost anywhere, reports gardening expert John DeGroot. If the weed has any benefits, it is that its seeds are sought by hungry birds. John DeGroot photo

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Canada thistle is not Canada’s friend. Nor is it Canadian. Originally from Europe and Asia, Canada thistle crossed the ocean in the 1600s and quickly spread to most parts of North America.

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