Hogweed
Giant Hogweed Heracleum mantegazzianum, otherwise known as the European botanical plant, Giant Hogweed. ... Giant Hogweed can grow to be about 15 feet in height and yet it’s very attractive, but the sap of it is toxic. ... Giant Hogweed, very distinctive, has hollow stems that can be 2 to 4 inches in diameter. ... A rather large plant like the Giant Hogweed, flowers from mid-June to mid-July.