Giant Hogweed is an Asian plant that was brought to North America about a
century ago and is now spreading throughout southern Ontario.
It can be hazardous to human health. Giant hogweed sap will make a person's
skin extremely sensitive to sunlight. Contact with a plant, followed by exposure
to the sun, can cause severe burning and blistering. If sap gets into your eyes,
it can lead to blindness.
If any sap touches your skin:
- wash the affected area immediately with soap and water
- keep the affected area out of the sun
- see your doctor if you have a reaction
Watch out for lookalikes
Giant hogweed is part of the carrot family and can sometimes be confused with
other common plants such as cow parsnip and angelica. This giant hogweed fact sheet compares giant hogweed to other
Giant hogweed on GRCA properties
Giant hogweed has been found on several GRCA properties near Belwood Lake,
St. Jacobs, Kitchener, Guelph and Cambridge.
The GRCA has a program to eliminate giant hogweed from its property, but it
is a persistent species that is difficult to remove. Options for removal include
spraying a herbicide or digging it out. GRCA staff take strict safety
precautions when dealing with hogweed.
If you spot giant hogweed
- on a GRCA property, such as a park, conservation area or other signed and
marked property, contact the GRCA's Operations Division at (519)
- on your own property, private land, a municipal park or other areas such
as along a riverbank or stream, contact your local municipal weed
Click on the name of a municipality to go to its page on giant hogweed or
Report sightings of giant hogweed to these municipal offices:
Weed inspector at 519-753-5768
- Brantford: Parks and Recreation Department at 519-756-1500
Weed inspector - 519-941-2362 or email firstname.lastname@example.org
Park Operations and Forestry department at 519-837-5626 or email mailto:email@example.com
Contact the bylaw enforcement staff at 905-318-5932
- Halton: Contact your local municipal office.
- Hamilton: Call 905-546-2489
- Oxford: Weed inspector at 519-539-9800, Ext. 3132.
- Perth: Weed inspector Marvin Smith 519-291-2236
of Waterloo - In North Dumfries, Wellesley, Wilmot and Woolwich townships
contact the Region's Area Weed Inspectors at 519-575-4400. In Kitchener,
Cambridge and Waterloo contact city hall.
Weed inspectors John Benham at 519-846-0941 or Angelo Giovinazzo at