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  • Native to South America

  • No known site in natural water bodies in the Boundary
  • Is tolerant of fluctuations in water level

(Myriophyllum aquaticum)

Quick Identification

  • Feather-like leave grow in whorls of 4 to 6 leaves

  • Emerged leaves are a brighter green than the rest of the plant

  • Tiny yellow-green flowers form at the base of each leaf in the whorl

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.

There are no know infestations in natural water bodies in the Boundary, though the species is present in man-made water features. Take measures to ensure there is no crossover, and to remove from water features in the flood zone. Report any suspected sites and practive Clean Drain Dry.

Tiny yellow-green flowers form at the base of each whorl.

Leaves & Stems
Leaves are feather-like with 20 to 30 segments per leaf. Leaves below water grow in whorls of 4 to 6 while those emerging from the water are more spike-like, dense, and a brighter green than the submerged leaves.

Parrotfeather Infestation

Rhizomes anchor the plant and easily grow from stem fragments.

Reproduction & Dispersal
Plant reproduced through stem and rhizome fragments as the plants found in North America only produce female flowers.


Though the plant does flower, there are no male plants in invasive populations so no viable seeds are produced.

Preferred Habitat
Grows aggressively in lakes, ponds, ditches and other freshwater habitats.

Interesting Facts
Parrotfeather can grow up to 30 cm out of the water.

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