where does giant hogweed grow in the us
Heracleum mantegazzianum Giant hogweed was among many foreign plants introduced to Britain in the 19th century as ornamental plants. It is now widespread throughout the British Isles, especially along riverbanks. By forming dense stands, they can displace native plants and reduce wildlife habitats.[9] It has spread in the northeastern and northwestern United States, and southern Canada and is an invasive species in Germany, France, and Belgium, overtaking the local native species, Heracleum sphondylium.[9] Giant hogweed was introduced to the Baltics during the Soviet era as fodder for cattle.[10]