Invasive Species: Reed Canarygrass

Phalaris arundinacea & aquatica

Invasive, non-native populations were planted during the 1800s and 1900s in the PNW as a forage crop.

Why is it important to control?

Reed canarygrass forms dense stands that degrade wetlands areas by suppressing native plant species growth. It crowds out desired vegetation and damages irrigation and drainage infrastructure.

How can you identify it?

Close up image of reed canarygrass flower stalkClose up image of reed canarygrass seeds
Habitat: Wet to moist habitats including forests, riparian areas and wetlands.
Life Cycle: Perennial
Height: Up to 6 feet
Leaf Description: Light green leaf blades sprout horizontally from main stem. Leaf blades are hairless, smooth, and flat.
Fruit & Flower Description: Small flower clusters.
Bloom Time: June to July

How do you control it?

  • Reed canarygrass is extremely difficult to control due to its dense growth and vigorous rhizomes.

  • Maintaining a healthy community of native vegetation that provides significant shade is the best way to prevent reed canarygrass from establishing.

  • Oregon State University recommends glyphosate and imazapyr for herbicide control. FOLLOW ALL LABEL DIRECTIONS!

  • Oregon Department of Agriculture has no approved biocontrols.

How to report it?

There are various ways you can report this noxious weed.

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