Okanagan most unwanted

Maxwel klassen and Matthew Gibb

What are invasive species

Canada thistle is misnamed, since it was brought to this continent from Europe in the early 1600's. Due to competition with crop plants, weed control legislation for Canada thistle was passed as early as 1795 in Vermont and 1831 in New York. Canada thistle is a problem even in Europe where natural enemies abound.



Invasion History
The Himalayan Blackberry, despite its name, comes from Europe and was introduced to America in 1885 by an American botanist who prized the plant for its abundant berries. By 1945, the plant had spread along the Pacific Coast and it is now widespread in much of the province. The fruit of the plant, the blackberry, is an obstacle in controlling the spread of the species, as people like the berries and want easy access to them.

The Invaders: Canada Thistle
Invasion of Place - Himalayan Blackberry
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