Giant Hogweed Alert
General Description: Biennial or perennial, flowering only once in its lifetime and reproducing only by seed. Plants forming rosettes to 1m (40in.) high the first year; in the second year, either sending up a flowering stem, or remaining vegetative and producing a very large rosette of huge leaves, these including their petioles, up to 2m (80in.) high, and flowering in the third year.
Please be aware that the phototoxic plant Giant Hogweed has been found in some Ontario locations. The sap of this invasive species can cause severe skin inflammations.
To see more photos and video on how to identify giant hogweed, please go to