Japanese Knotweed (Fallopia japonica) on May 9, 2025
Submitter has sample
Description of specimen
Unoccupied private and city property covered in knotweed
Submitter has sample
Unoccupied private and city property covered in knotweed
Thank you for your report. Unfortunately, Japanese knotweed is not a species that’s currently being managed broadly by the city of Portland, and its removal is not required by city code. This location will be noted on the state-wide map, though, for future reference and analysis.
Check out this link for more information as well from OSU Extension.
https://solvepestproblems.oregonstate.edu/index.php/weeds/knotweeds
Jacob Rose
May 14, 2025, 2:22 a.m.