Land Plants - invasive

Spotted Knapweed (Centaurea stoebe ssp. micranthos) on Sep 2, 2026

Description of specimen

Submitter does not have a specimen
EDRR Status: Population assessed

Blue flower. I looked a number of internet pictures; the flowers and folage all agree that it is Spotted Knapweed.
Fred Pollastrini

Commentary

None

Remedy

Information on identification and control of knapweed species from Oregon State Extension.

Location

Spotted Knapweed - mostly along the north side of Warriner Rd. for I'd say between a 200' and 400' long stretch. There are a few on the south side. Currently, many have already gone to seed.

Expert Reviewer

Avatar of Reviewer

Brendan Fordyce
Clackamas Soil & Water Conservation District

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