Giant Hogweed Identification Guide from the New York Invasive Species Clearinghouse (Cornell University Cooperative Extension) (PDF)

Giant Hogweed Fact Sheet from New York Invasive Species Information

Giant Hogweed Fact Sheet from the Massachusetts Introduced Pests Outreach Project

Rhode Island Giant Hogweed Pest Alert (PDF)

Giant Hogweed Look-a-Likes from the State of Maine

New York Department of Environmental Conservation – Giant Hogweed

Giant Hogweed Information from the Washington State Noxious Weed Control Board

Giant Hogweed – Washington State University