Giant hogweed - Ville de Kirkland

Alerts

To keep you informed of important messages from the city!

2026-08-21

August 21, 2026 – Pressure testing on the water distribution network - Dragon Street - to resume on Monday, August 24 between 8 a.m. and 3 p.m.

Possible discoloured water and drop in water pressure for certain addresses on Dragon street

2026-08-20

August 20, 2026 - Drinking water supply interruption AND boil water advisory for certain addresses on Charlevoix, Rougemont and Marcel-Meloche streets

Drinking water supply interruption AND boil water advisory for certain addresses on Charlevoix, Rougemont and Marcel-Meloche streets

Works Info

Stay informed about the work being carried out in the city, whether it involves road repairs, infrastructure maintenance, work on the water network, or park redevelopment. For any questions or to report an issue related to the work, please call 514-694-4100.

2026-08-07

Road Reconstruction – Place du Souvenir, Aesop St., Allard St., Derome St., Pasquini St.

Road Reconstruction – Place du Souvenir, Aesop St., Allard St., Derome St., Pasquini St.

2026-08-03

Replacement of a section of the storm sewer network on Argyle Street

Replacement of a section of the storm sewer network on Argyle Street.

2026-06-29

Reconfiguration of the merge lane onto Saint-Charles Boulevard South at the Sainte-Marie Road East intersection

Reconfiguration of the merge lane onto Saint-Charles Boulevard South at the Sainte-Marie Road East intersection, starting June 29.

Giant hogweed

Giant hogweed

A giant plant to avoid!

Giant hogweed (Heracleum mantegazzianum) is an invasive exotic plant. Its sap contains toxins which, after exposure to the sun, can cause serious skin burns. There have been no cases of giant hogweed detected in Kirkland to date.

How to correctly identify the plant

Giant Hogweed has an alter ego in Quebec, Indian celery or cow parsnip. Smaller in size, the aerial parts of this indigenous plant are much less poisonous (varies according to an individual’s sensitivity). In addition to cow parsnip, certain plants with white umbrella-like flowers can often be mistaken for giant hogweed. That may be the case for angelica, wild carrot, valerian, yarrow, etc. For most people, these plants do not cause dermatitis.

Below are a few characteristics to help you distinguish the two plants:

Giant Hogweed
(Heracleum mantegazzianum)

Indian Celery or Cow Parsnip
(Heracleum maximum)

Plant Height

2 to 4 metres
(6 to 12 feet)

Plant Height

2 metres or less
(3 to 6 feet)

Stem

Rigid (5 to 10 cm (2 to 4 in.) in diameter)
Hollow and ridged
Green and purple blotches with coarse white hairs near the leaf junctions

Stem

Rigid (5 cm (2 in.) in diameter or more)
Hollow and ridged
Green, covered in fuzzy white hairs and sometimes slight purplish spots

Leaves

Generally smooth, the leaves can measure up to 1.5m across. The leaf underside is green. Hairs, when present, are stiff and parse.

Leaves

Smaller, the leaves measure up to 50 cm (2.5 ft) across. The underside is generally covered in soft white hairs for a velvety, light green (greyish) appearance.

If you spot giant hogweed or suspect its presence in the municipality, please contact the eco-counsellor by phoning the Green Line so the plant can be more accurately identified. If the plant is growing on your property, the eco-counsellor will advise you on how to eliminate them.

For more information

For information on health effects and what to do if you have been in contact with giant hogweed sap, contact Info-Santé (8-1-1).
Other reference sites

Ministère du Développement durable, de l’Environnement et des Parcs

Website: http://www.mddep.gouv.qc.ca/biodiversite/nuisibles/berce-caucase/index.htm