Upon further investigation about the location of “local” infestations of the highly invasive giant hogweed, it was determined that the Wisconsin location is in Iron County which is located at the northern boundary between Wisconsin and the Upper Peninsula of Michigan (see colored area on the map). Gogebic County, Michigan also has or had infestations of giant hogweed. The U.S. Forest Service is working diligently to eradicate these populations.
Iowa State University
Owen, Michael D., "Beware of a Dangerous Invasive Weed -- Updated" (2008). Integrated Crop Management News. 933.
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