Canadian waterweed
Canadian waterweed is an invasive aquatic plant found in lakes and waterways. It can spread rapidly, form dense growth and alter aquatic environments. The species is included on Sweden’s national list of invasive species.
Why is it a problem?
- Forms dense vegetation that outcompetes native aquatic plants and reduces biodiversity.
- Affects oxygen and light conditions in the water, which can harm fish and other aquatic organisms.
- Spreads easily through small plant fragments carried by boats, equipment or water currents.
How to identify Canadian waterweed
Length: Can grow several metres long below the water surface.
Leaves: Narrow, light green leaves arranged in whorls around the stem.
Stem: Thin, branched and flexible, often forming dense tangles.
Habitat: Lakes, ponds and slow-flowing water.
What can you do?
- Avoid spreading plant fragments between different bodies of water, for example via boats or fishing equipment.
- Clean equipment that has been in contact with water.
- Report sightings at invasivaarter.nu External link..
contact
Citizen Service
Email: kommunen@boden.se
Phone: +46 921 620 00