Parrotfeather Myriophyllum aquaticum

By: Natalie Bonitz

Distribution

FactsForms mats of vegetationDoesn’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

Identification Bright green fir-tree-like; emergent leaves

and stemsLeaflets arranged in whorls (4-6) around the

stemLeaflets with feather-like leaf arrangement Dense mat of intertwined brownish stems

(rhizomes) in the waterReddish, feathery-leaved, limp, underwater

leaves may be presentWhite flowers

In Flower

Source Native to South America

Amazon River Introduced in the late 1800s

Reproduction

All female plants

Perennial

Control MethodsHard to controlHerbicides aren’t

very effective Not palatable to

fishMechanical

methods spread the rhizomes

Resources http://www.ecy.wa.gov/programs/wq/plants/w

eeds/parrot.htmlhttp://www.ecy.wa.gov/programs/wq/plants/w

eeds/aqua003.htmlhttp://

boggycreekpondsupply.com/navitrolr-granular-aquatic-herbicide.html

Questions?Uh OH!