Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on Oct 1, 2022

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

Description of specimen

This large clump of Japanese Knotwood has been growing along the west side of Chaplin Way for years.


Greetings Ms Fisher,

I want to thank you for reporting this infestation of knotweed. Japanese knotweed is a significant problem invader within Clackamas County. The Clackamas Soil and Water Conservation District is working with regional partners to map and catalog known infestations of knotweed to help prioritize future control efforts.

Unfortunately, the resources required to control this invader are limited in relation to the overall need. We are currently treating a number of knotweed patches at priority sites across Clackamas County. Your report will help us to prioritize future knotweed treatments.

I am passing along your report to our WeedWise program specialist working in your area. If we are able to assist with treatment this season, we will contact the landowner for additional information.

If you are interested in learning more about the control of this invasive weed, please take a look at the resources provided below.

Thanks again for taking the time to report your knotweed. Please feel free to contact me if you have any additional questions.


Samuel Leininger
WeedWise Manager
Clackamas Soil & Water Conservation District
22055 S Beavercreek Road, Ste 1
Beavercreek, OR 97004

Samuel Leininger
Oct. 3, 2022, 8:36 a.m.