Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on May 8, 2025

Submitter has sample
EDRR Status: Local expert notified

Description of specimen

Some chutes of knotweed extending above the fence from/near Phillips creek and smaller ones on the other side of the fence closer to the road. Lots of garbage so i didnt poke in to get a better idea of how extensive it is.

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

On the north side of SE Causey Ave in Portland, OR.

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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