Boundary Invasive Species Society
Parrotfeather
(Myriophyllum aquaticum)
Parrotfeather is known to grow in water gardens and possibly aquariums in the Boundary. To our knowledge it has not escaped yet. Please report it if you think you have seen this plant.
Identification:
Parrotfeather is a perennial that is native to South America. It spreads by plant fragments. Leaves are whorled and feather-like with 20-30 segments per leaf. Submerged leaves are 1.5-3.5 cm long and emergent leaves are 2-5 cm long and much greener. The flowers in axils of emergent leaves form a terminal spike above the water. Only female white flowers are known to occur in North America.
Impacts:
Parrotfeather creates dense mats which clogs waterways, displaces native vegetation, creates stagnant waters which increase breeding grounds for mosquitoes and affect recreational activities such as boating, swimming and fishing.
Prevention:
Inspect your boat, trailer and equipment after each use. Remove all plants, animals and mud before moving to a new waterbody. Avoid using parrotfeather in your aquarium or water garden. Drain your aquarium on dry land. Rinse all recreational equipment with high pressure, hot water or let it dry in the sun for at least 5 days.