Giant hogweed (Heracleum mantegazzianum) is a biennial herb that grows 8-14 feet in height. Plants sprout in early spring from forked taproots or seeds. The stems are hollow, and the leaves are lobed. The best time to identify giant hogweed is when it is in bloom in June.
NOTE: If you receive a "sign in" message, click cancel to continue. Confirmed observations of Giant hogweed submitted to the NYS Invasive Species Database. For more information, visit iMapInvasives
This plant colonizes rich, moist soils along roadside ditches, stream banks, waste areas, and forest edges.
Threats & Impacts:
Giant hogweed is on the federal noxious weed list because of its dangerous sap. It threatens riparian areas by displacing native plants and exacerbating soil erosion.
Giant Hogweed Biology:This page describes the biology of giant hogweed plants, including their growth and devlopment stages, seed dispersal and viability, as well as the habitat and competition for giant hogweed plants.