Invasive Species: Reed Canarygrass

Phalaris arundinacea

Planted as a forage crop in the late 1800s/ early 1900s, Reed canarygrass is widespread in Western Oregon.

Why is it important to control?

Reed canarygrass thrives in wet locations and will take over, creating a thick mat. In this way it degrades wetland areas by supressing native species growth. It can damage irrigation and drainage infrastructure.

How can you identify it?

Reed canarygrass(Phalaris arundinacea) leaf stem closeupReed canarygrass(Phalaris arundinacea) at edge of water.
Habitat: Streamside, wetlands, marshes, road ditches
Life Cycle: Perennial
Height: 6ft
Leaf Description: Blades 0.75in wide and 1-4ft long; 45 degree angle from stem; papery membrane at attachment
Fruit & Flower Description: The inflorescence color changes from green to purplish to tan as the seeds mature.
Bloom Time: June to July

How do you control it?

  • Digging out is difficult, but can work for really small areas.

  • A non-selective herbicide may be used for larger patches in spring or fall.

  • It will take repeated effort over several years to eradicate.

  • Herbicide control:  Oregon State University Extension recommends a glyphosate or imazapyr based herbicide. Take care to avoid drift and be cautious near crops. FOLLOW ALL LABEL DIRECTIONS!

  • No biocontrols have been identified.

How to report it?

There are various ways you can report this noxious weed.

For More Info: