Giant hogweed is an invasive plant species that upon contact can cause physical harm to humans and pets. The public is advised not to touch giant hogweed.
Many similar plants can be mistaken for giant hogweed including cow parsnip, Queen Anne's lace (also known as wild carrot) and angelica. The following link can help you identify giant hogweed:
Invasive Species Centre – Giant hogweed Information page
City staff manage hazardous vegetation, including giant hogweed, when it is located near publicly accessible areas (such as along trails and pathways or near a bench or City building).
If you think you have spotted giant hogweed in a public space, first use online sources to confirm you have correctly identified it. Familiarize yourself with the identifying features of giant hogweed, as well as how it is differs from common look-a-like plants. Do not touch the plant or attempt to remove it on your own.
If you or your pet have come in contact with giant hogweed wash the area immediately, avoid sun exposure and seek medical advice.
Report any giant hogweed in City parks if the plant is growing near maintained trails and pathways or mown areas of parkland. The City only manages giant hogweed that is growing adjacent to public areas. Do not leave maintained trails and pathways to look for giant hogweed.
If you have identified a site with giant hogweed, contact the City of Toronto’s Parks staff at parks@toronto.ca. When reporting a sighting include in your email the park name, location of the plant within the park and any identifiable structures or features that are in proximity to the plant (such as signs, paths, benches, etc). This information will assist staff in locating the plant within the park.
If you wish to report a sighting of giant hogweed on private property, please submit a service request here, or contact 311.