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