- Contact information
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For information on Lakes in Wisconsin, contact:
- DNR Lake
Division of Water
Bureau of Water Quality
- Aquatic Invasive Species Contacts
Giant hogweed (Heracleum mantegazzianum) - Washington Rd (Station #10053223) Pop. #388
- Status
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Verified
- Date First Found
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6/22/2019
About
Giant Hogweed
Giant hogweed is a herbaceous biennial or monocarpic perennial that grows as a bushy rosette for at least the first year. In general, it will bolt in the second year and grow to be 8-15’ tall with hollow, ridged stems covered in coarse white hairs and reddish-purple mottling. The plant dies after seed dispersal. It invades roadsides, empty lots and woodland edges. Due to fast growth rates, it can crowd out native vegetation. Giant hogweed prefers moist areas with some shade, particularly along stream banks, where it can lead to soil erosion and can disperse seeds downstream. Sap from leaves and stems on skin, when exposed to sunlight, can cause a phytophotodermatitic reaction consisting of severe burns and blisters.