Land Plants - invasive

Bohemian Knotweed (Fallopia x bohemica) on Apr 7, 2026

Originally reported as Giant Knotweed (Fallopia sachalinense)

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

Description of specimen

Big heart shaped leaves and stems that look like bamboo

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

Information on identifying and controlling Bohemian Knotweed from the Washington State Noxious Weed Board

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

Location

Two plants not far apart by sidewalk on mcloughlin above milwaukie bay park

First big one between park one way exit and the sewage plant

The second small one by sidewalk by sewage plant entrance/exit.

Pics below. I think Giant Knot Weed

Expert Reviewer

Avatar of 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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