Submitter does not have a specimen
EDRR Status: Local expert notified
a big healthy clump. be happy to meet you there if you don't see it.
Identify and manage knotweeds in the Pacific Northwest
a big health clump of japanese knotweed on the south side of the Clackamas River just downstream from the boat ramp at Clackamette Park.
Samuel Leininger Clackamas Soil and Water Conservation District4-County Cooperative Weed Management AreaColumbia Gorge Cooperative Weed Management Area
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