Invasive white camas (Photo by NCC)

Invasive white camas (Photo by NCC)

Invasive Species Gallery

  • Autumn olive (Photo by James H. Miller)
    Autumn olive

    Autumn olive, along with several other non-native invasive shrubs, was planted in southern Ontario in the 1970s by well-meaning land managers thinking that they would provide excellent wildlife habitat.
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  • Canada thistle (Photo by NCC)
    Canada thistle

    Despite its name, this invasive thistle is not from Canada. It is believed to have come over from the eastern Mediterranean region. It was likely one of the first weeds that early settlers imported to North America.
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  • Common tansy (Photo by NCC)
    Common tansy

    Common tansy is native to Europe, and was introduced to North America in the 1600s as a horticultural and medicinal plant.
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  • Dog-strangling vine (Photo by Couchiching Conservancy)
    Dog-strangling vine

    European swallow-wort, most commonly known as dog-strangling vine, is a member of the milkweed family. Despite its name, it doesn't pose any real threat to dogs.
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  • Emerald ash borer adult (Photo by by U.S. Department of Agriculture)
    Emerald ash borer

    The emerald ash borer (EAB) is a green beetle that was first discovered in North America in 2002. It is native to Asia and is a threat to the entire North American Fraxinus genus, commonly known as ash trees.
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  • European buckthorn berries (Photo by Helen Fabbri, City of Winnipeg Naturalist Services Branch)
    European buckthorn

    European buckthorn is native to Eurasia. It was introduced to North America as an ornamental shrub for fencerows and wildlife habitat. This invasive alien species is found in Manitoba and is a large problem in natural areas in Winnipeg.
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  • Juvenile European green crab (Photo by Luis Miguel Bugallo Sanchez)
    European green crab

    The European green crab is considered an aggressively invasive alien species in most of the regions it inhabits. It has spread across the globe by hitching rides on the hulls of ships and is now found on every continent except for Antarctica.
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  • 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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