The sap of the giant hogweed plant can cause third-degree burns and blindness.

The sap of the giant hogweed plant can cause third-degree burns and blindness.
Photo Credit: Darren Calabrese/The Canadian Press/file

Noxious giant hogweed plant spreading in Canada


The Nature Conservancy of Canada is urging Canadians to document sightings of the giant hogweed plant which it says can pose a serious health hazard for humans. The extremely invasive plant is thought to have come to Canada from Asia and Eastern Europe in the 1940s and is now found in the Atlantic Provinces in the east and in the provinces of Quebec, Ontario and British Columbia.

Although it only flowers once in its lifetime, the giant hogweed can produce up to 120,000 winged seeds that can live in soil for up to 15 years.
Although it only flowers once in its lifetime, the giant hogweed can produce up to 120,000 winged seeds that can live in soil for up to 15 years. © Darren Calabrese/The Canadian Press

Plant can cause blistering, burns, blindness

If the plant’s clear sap comes into contact with the skin, exposure to sunlight will cause blistering third-degree burns. If it gets into the eyes it can cause blindness. The plant can also overcome native plants threatening biodiversity. It spreads especially quickly when seeds travel down rivers and streams. They also fly on the wind.

The conservancy suggests people who see the plant document it on apps such as iNaturalist. This provides information to scientists and to jurisdictions that seek to eradicate the plant.

Professional help is recommended

People who find the plant on their property are urged to get professionals to remove and dispose of it. Goggles, face masks, heavy gloves and protective clothing must be worn to avoid exposure. Plants should be dug up, left to dry and then put in black garbage bags in the sun for a week, advises the conservancy website. Or professionals can use herbicide in spring or fall.

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Posted in Environment, Health

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One comment on “Noxious giant hogweed plant spreading in Canada
  1. PDb says:

    Needs to be eradicated. Listen the song by Genesis ‘Return of the Giant Hogweed’