This week's invasive species: Eurasian water-milfoil

This week’s invasive species is Eurasian water-milfoil (Myriophyllum spicatum). This perennial aquatic plant has two look alikes- the native species northern water-milfoil and the invasive species parrot feather. The key difference between Eurasian water-milfoil and northern water-milfoil is that the latter has leaves with 11 or fewer leaf segments. Parrot feather has not yet been detected in Ontario. Here are some fast facts about the species:

• Native to: Europe, Asia and Northern Africa
• Identifying Features: Eurasian water-milfoil grows underneath the water’s surface and has 12 or more leaf segments. It has a small red flower that blooms in late July and early August.
• Why it’s problematic: Eurasian water-milfoil out-competes other native species, resulting in a loss of biodiversity. It can also grow into very dense patches, creating stagnant water, which is attractive to mosquitoes. Decomposing plant results in reduced oxygen levels in the water which can kill fish.

Remember, if you think you have spotted Eurasian water-milfoil or any kind of invasive species, call the Invading Species Hotline at 1-800-563-7711 or make a report to EDDMapS Ontario at https://www.eddmaps.org/ontario/.