Invasive Giant Hogweed has a sap than can burn your skin. It is hard to tell the difference between the invasive Giant Hogweed and native Cow Parsnip locally known as Hákwa7. This feature shows photos that will give you the clues on how to tell the difference between the two. Please note that Giant Hogweed can grow up to 14 feet tall whereas Cow Parsnip generally grows only up to 6 feet tall. Please REPORT ALL Possible SIGHTINGS of Giant Hogweed!