Where does the species originate from?
Eurasian watermilfoil originates from Europe and Asia.
How is it introduced and spread?
Milfoil was once commonly sold as an aquarium plant. Now it is largely spread through escapes or releases from ornamental ponds, boat trailers moving between waterbodies, and subsequent natural dispersal. Wildlife, water currents and flood events can all carry small fragments of the plant to new places where it can reproduce vegetatively. This means it only takes a small stem or plant fragment to start new colonies in waterbodies where it is introduced.
This aquatic plant grows in dense patches, excluding light from native species and creates stagnant areas with low oxygen levels below the large floating mats. Recreational activities such as fishing, swimming and boating are greatly impaired where thick mats occur.
· Milfoil can grow up to 2 inches per day.