Giant Hogweed Heracleum mantegazzianum Up to 15 ft. tall herbaceous perennial; sap can cause severe skin irritation, blisters and swelling, temporary or permanent blindness Additional Resources MISC Invader of the Month press release. April 2003 Invasive.org Related PDF File Report Giant Hogweed in Maryland

Photo: D. Robbins, MDA Photo: D. Robbins, MDA Baltimore County infestation