Conservation experts in Ottawa are waging war on Japanese knotweed, an aggressive, invasive plant species which has taken root in more than a dozen places on the city's shorelines.
If it's not controlled, biologists warn the foreign plant — strong enough to break through walls and roads — will spread, displacing wildlife and crowding out native plant species in many areas...http://www.cbc.ca/beta/news/canada/ottawa/plants-invasive-japanese-knotweed-ottawa-1.4214989
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