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Eurasian Watermilfoil

Eurasian water-milfoil is an invasive aquatic plant native to Europe, Asia and northern Africa. Introduced to North America in the 19th century, it is now one of the most widely distributed invasive aquatic plants on the continent. It may have been introduced through the aquarium trade or the ballast water of ships.

What is it? Eurasian Watermilfoil (EWM) is an invasive aquatic plant.
Where did it come from? Europe, Asia, and Northern Africa.
Where is it found? In lakes, throughout Ontario
What does it do? EWM’s aggressive growth chokes out other native plants and reduces biodiversity. EWM can reduce dissolved oxygen levels in the water and lead to fish kills, and EWM makes boating and swimming really hard.
What can you do? Inspect, clean, and drain your boat!