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Spotted knapweed growing in a farm field in the Wisconsin countryside. Centaurea stoebe plants are colorful purple wildflowers that grow in pastures, fields, and meadows during the fall and summer seasons. It is a beautiful flower, but Spotted knapweed is a harmful noxious weed, an invasive plant that can harm crops and other plants. Spotted knapweed weeds grow in most areas of North America, and can be found in other areas as well.