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Giant Hogweed

The edge of a forested area. There is a man with a red spraying device that he is using to spray some of the edge plants. One of the plants is taller than the man. It has large leaves and flowers larger than his head. The flowers are made of smaller individual flower clusters much like queen Ann's lace.

Other names: Giant Hogweed, Giant Cow Parsley (Not Cow Parsnip), Cartweel-Flower, Heracleum mantegazzianum

Where did it come from?

These plants were brought from Caucasus Mountain region in the early 1900s to be used as a garden plant in New York.

Why is it invasive?

Even minor contact with this plant can cause SEVERE BURNS. Sap from giant hogweed combines with moisture and sunlight to burn skin. In addition, it crowds out native flora on roadsides, empty lots, and woodland edges and contributes to erosion.

How do you prevent its spread?

Clean your shoes and clothes after walking through areas with hogweed. If you find any seeds, destroy them.


Species assessment

Giant hogweed: Don’t touch this plant!

Seen it? Report it! Through the app or online.

Image credit: Terry English, USDA APHIS PPQ, Bugwood.org