Japanese Knotweed (Fallopia japonica) on Apr 12, 2020
Submitter has sample
Description of specimen
Stand looks to be a least several years old. Mostly along the fence line in the alley, but also spreading into adjacent properties.
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
West side of alley, 3-4 houses down from Rhone St. 45.493488, -122.598912
Expert Reviewer
Mrs. Lindsey Wise Oregon Biodiversity Information Center, inr.oregonstate.edu/orbic Oregon iMapInvasives Institute for Natural Resources Portland State University