Invasive white camas (Photo by NCC)

Invasive white camas (Photo by NCC)

Invasive Species Gallery

  • Invasive garlic mustard, Clear Creek Forest, Ontario (Photo by NCC)
    Garlic mustard

    Brought to North America by early colonists, this invasive alien plant is now spreading across the continent at a rate of 6,400 square kilometres per year; an area 10 times the size of Toronto.
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  • Giant hogweed (Photo by Wikimedia Commons)
    Giant hogweed

    Giant hogweed is an extremely invasive species that originated from Asia and Eastern Europe. It is a perennial and a member of the carrot and parsley family. Giant hogweed can pose a serious health hazard for humans. If the plant’s watery, clear sap comes into contact with human skin and is then exposed to sunlight, the UV radiation can cause severe burning and weeping blisters.
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  • Glossy buckthorn (photo by Calin Darabus)
    Glossy buckthorn

    Glossy buckthorn is a non-native tree that was introduced to Canada from Eurasia approximately 100 years ago.
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  • Japanese barberry (Photo by Wildfeuer, Wikimedia Commons)
    Japanese barberry

    Japanese barberry is an invasive shrub that is native to Japan and was introduced to the United States as an ornamental plant in 1875. The plant is a compact woody deciduous shrub with arching branches.
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  • Japanese knotweed (Photo by NCC)
    Japanese knotweed

    Japanese knotweed is a perennial plant originally from eastern Asia. It was brought over to North America in the late 1800s for ornamental purposes and to reduce erosion and feed livestock.
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  • Leafy spurge (Photo by Ed L/pawpaw67)
    Leafy spurge

    Native to central and southern Europe, leafy spurge is believed to have been transported to North America in the early 19th century, then spread across western Canada.
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  • Himalayan balsam (Photo by Keith Williamson)
    Policeman's helmet

    Himalayan balsam, commonly known as policeman’s helmet, is an invasive alien species threatening wetlands throughout the world.
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  • Purple loosestrife (Photo by Liz West, Wikimedia Commons)
    Purple loosestrife

    Purple loosestrife is a wetland plant native to Europe and Asia that was brought to North America in the early 19th century. This highly invasive plant was likely introduced when its seeds were included in soil used as ballast in European sailing ships and discarded in North America. The plant is still used in flower gardens and occasionally sold in nurseries today.
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