Japanese Knotweed (Fallopia japonica) on Oct 26, 2025
Submitter does not have a specimen EDRR Status: Local expert notified
Description of specimen
Estimated 20 x 40 foot infestation of Japanese knotweed.
Commentary
None
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 Japanese knotweed is just north of Mapleton Drive on the edge of a small canyon in West Linn. 45.38528N, 122.62924W
Expert Reviewer
Samuel Leininger Clackamas Soil and Water Conservation District 4-County Cooperative Weed Management Area Columbia Gorge Cooperative Weed Management Area