Water Soldier in Cooks Bay: Protecting Lake Simcoe from Invasive Species
An invasive aquatic plant, water soldier (Stratiotes aloides), has been identified in Cooks Bay—a concerning development for the health of Lake Simcoe and the connected waterways of Simcoe County.
What Is Water Soldier?
Water soldier is a floating aquatic plant with long, pointed green leaves arranged in a rosette shape. Its sharp, serrated edges distinguish it from most native plants. Originally from Europe and Asia, it was likely introduced to Ontario through ornamental ponds or water gardens.
The species is now listed as prohibited under Ontario’s Invasive Species Act, meaning it cannot be imported, sold, or released into the wild.
Why It Matters
Once established, water soldier can spread rapidly and disrupt local ecosystems.
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Crowds out native plants: It forms dense mats that block sunlight and reduce oxygen levels, affecting fish and other aquatic life.
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Impacts recreation: The thick growth can interfere with boating, swimming, and fishing.
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Difficult to control: Removal is costly and time-consuming, making prevention and early detection essential.
What Residents Can Do
Protecting Lake Simcoe starts with community awareness and prevention.
1. Learn to Recognize It
Water soldier has sharp, saw-tooth leaves arranged in a floating rosette. In late summer, it often forms thick clusters near the water’s surface.
2. Report Sightings
If you believe you’ve seen water soldier:
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Take a photo and record the location.
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Report it through EDDMapS Ontario – Report an In..., iNaturalist, or by calling the Invading Species Hotline at 1-800-563-7711.
Do not attempt to remove it yourself.
3. Clean, Drain, and Dry
After using boats or water equipment:
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Clean all plants, mud, and debris.
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Drain all water compartments.
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Dry equipment thoroughly before visiting another waterbody.
4. Dispose of Aquatic Plants Responsibly
Never release garden or aquarium plants into ponds, rivers, or lakes. Seal unwanted plants in a bag and place them in the garbage.
Protecting Lake Simcoe Together
Cooks Bay and Lake Simcoe are vital parts of our community. By learning about invasive species and following simple prevention practices, residents can help protect local lakes and drinking water sources for future generations.