Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on Aug 12, 2013

Submitter does not have a specimen
EDRR Status: Population assessed

Description of specimen

Knotweed. Varying stages of plant size.

Commentary

Good Morning Rich,

Thanks for sharing the report of the Japanese knotweed at Molalla River State Park. This is an infestation that folks have been working on for some time now. I notified the Park Manager for Molalla River State Park and they have been informed of the infestation. Thanks again for the information. All the best,

Samuel Leininger
WeedWise Program Manager
Clackamas Soil & Water Conservation District
221 Molalla Ave. Suite 102
Oregon City, OR 97045
503-210-6006
sleininger@conservationdistrict.org
www.conservationdistrict.org

Samuel Leininger
Aug. 14, 2013, 2:36 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

Molalla River State Park. The majority or the concentration was centered around the peninsula of land at the mouth of the Molalla river. Access via the walking path from Molalla River State Park or by boat at the mouth of the Molalla.

Expert Reviewer

Samuel Leininger
Clackamas Soil and Water Conservation District
4-County Cooperative Weed Management Area
Columbia Gorge Cooperative Weed Management Area

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