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The invasive and phototoxic species of Giant Hogweed is being treated at Hadley Point with an herbicide, which will take a number of applications and weeks to be eliminated. The areas being treated are well-marked. Giant Hogweed is a phototoxic plant, meaning the sap can cause serious skin inflammations. If contact is made with the eyes, it can cause blindness. Click the link below for Giant Hogweed identification.