Ever forage for wood or kindling? Common around waterways, beware that the sap from Giant Hogweed seriously burns you via Phytophotodermatitis, even for many years after initial exposure.
Yes you cannot overstate the danger of GIANT HOGWEED! Watch this super informative video show you just how - Go to 14:40 in the video to learn how to spot the young plants as well as when fully grown.