06/03/2026
Anyone spending time on the water this season is asked to be on the lookout for water soldier, a prohibited invasive aquatic plant in Ontario.
This species forms dense, floating mats that can obstruct navigation and restrict access for fishing and other on-water activities. In addition to these impacts, it also displaces native vegetation and degrades habitat for fish species and wildlife, impacting the quality of our fisheries and aquatic ecosystems.
In Ontario, known populations of water soldier are currently limited to the Trent–Severn Waterway, the Bay of Quinte, Redhorse Lake, and Cook’s Bay, Lake Simcoe.
If you suspect you’ve encountered water soldier, take clear photographs, note your location, and report the sighting to the Invading Species Hotline at 1-800-563-7711 or submit a report online at www.EDDMapS.org.
Photo credit: Dense mat of water soldier in Cook’s Bay, Lake Simcoe. Courtesy of Ducks Unlimited, 2025.