Japanese Knotweed (Fallopia japonica) on May 4, 2026
Submitter does not have a specimen EDRR Status: Local expert notified
Description of specimen
Heart shaped leaves, bamboo like stock that is hollow.
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
Along river forest lake. Just a few plants on two different clumps. This in near my home and along one of my daily walk, so I plan to keep it clipped at the level of the dirt for the next several years until it hopefully gives up (unless you think that’s a bad idea - but it was one of the possible containment strategies I read, provided you dry the intact stalks completely before throwing them in the trash).
Expert Reviewer
Samuel Leininger Clackamas Soil and Water Conservation District 4-County Cooperative Weed Management Area Columbia Gorge Cooperative Weed Management Area
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