Land Plants - invasive

Giant Knotweed (Fallopia sachalinense) on Jun 16, 2011

Submitter has sample
EDRR Status: Population assessed

Description of specimen

No description provided

Commentary

Can you help readicate this weed. I understand it is extremely difficult to eradicate and that amatuer efforts can make the infestation worse.
I live at 14162 SE Holgate, Portland, OR 97236

Reporter
June 16, 2011, 2:51 p.m.

Hi, James. We can certainly try to help out with your knotweed patch. I'll be by during the day today, June 20th, to have a look. We can talk about treatment details then, or later. Feel free to contact me directly at mitch.bixby@portlandoregon.gov.

Thanks for the report!
-Mitch

Mitch Bixby
June 20, 2011, 2:41 a.m.

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

At the east end of SE Holgate near the start of the Old Holgate trail to Powell Butte Park about 50 yards south east between two driveways. Also look south across the road from the trailhead. There you will find patches of Giant Knotweed. There is also some west of a red metal barn on my property at 14162 SE Holgate. Some of the knotweed mentioned above is on my property and some is on neighbors property.

Expert Reviewer

Mr. Mitch Bixby
City of Portland - Bureau of Environmental Services (BES)

© 2025 Portland State University | Contact us for questions regarding site content