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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
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