Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on Jun 28, 2025

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

Large Japanese Knotweed plant

Commentary

Great observation and photos Andrea! Check out our website for best management practices on how to control Japanese Knotweed. It’s a state “B” listed weed by ODA and bio-control efforts are being conducted as well.
https://tillamookcountyswcd.org/
Michael Blankenship, TCSWCD.

Michael Blankenship
June 30, 2025, 1:28 a.m.

Remedy

Oregon State University's Solve Pest Problems page has some great information about how to get rid of knotweeds Solve Pest Problems

This is a tricky weed to manage. Consider reaching out to your local Soil & Water Conservation District for technical advice.

Location

The knotweed is in my neighbors yard, spreading into every other property on the block.

Expert Reviewer

Michael Blankenship
Tillamook Soil & Water Conservation District

© 2025 Portland State University | Contact us for questions regarding site content