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Parrotfeather: Invasive Aquatic Plant with Unique Adaptations

Parrotfeather (Myriophyllum aquaticum) is an invasive aquatic plant known for forming dense mats of vegetation, hindering fish movement and adapting well to water level changes. Originally from South America, it was introduced in the late 1800s and is difficult to control. This plant is characterized by its bright green, fir-tree-like emergent leaves and feather-like underwater leaves. Control methods include herbicides and mechanical removal, but both have limitations due to its hard-to-control nature. Learn more about this challenging aquatic plant and its management in Washington.

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Parrotfeather: Invasive Aquatic Plant with Unique Adaptations

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  1. ParrotfeatherMyriophyllumaquaticum By: Natalie Bonitz

  2. Distribution

  3. Facts • Forms mats of vegetation • Doesn’t spread into deeper water • Fish have a hard time swimming through the mats • Adapted to water level changes • Washington listed as a quarantined plant

  4. Identification • Bright green fir-tree-like; emergent leaves and stems • Leaflets arranged in whorls (4-6) around the stem • Leaflets with feather-like leaf arrangement • Dense mat of intertwined brownish stems (rhizomes) in the water • Reddish, feathery-leaved, limp, underwater leaves may be present • White flowers

  5. In Flower

  6. Source • Native to South America • Amazon River • Introduced in the late 1800s

  7. Reproduction • All female plants • Perennial

  8. Control Methods • Hard to control • Herbicides aren’t very effective • Not palatable to fish • Mechanical methods spread the rhizomes

  9. Resources • http://www.ecy.wa.gov/programs/wq/plants/weeds/parrot.html • http://www.ecy.wa.gov/programs/wq/plants/weeds/aqua003.html • http://boggycreekpondsupply.com/navitrolr-granular-aquatic-herbicide.html

  10. Questions? Uh OH!

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