Land Plants - invasive

Knotweed (unknown species) (Fallopia sp.) on Sep 16, 2008

Originally reported as Japanese Knotweed (Fallopia japonica)

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

Tall, green, heart-shaped leaves with white flowers.

Commentary

Hi!

I have forwarded you report to Lucas Nipp, Invasive Weed Technician at the East Multnomah SWCD. He will go to the site and if he can get permission from the landowner, work out treatment plans.

Thank you very much for your report, and happy swift watching! :>)

Vern Holm

Vern Holm
Sept. 29, 2008, 8:11 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 Chapman school (where people go to watch the Vaux Swifts) I saw a huge patch of Japanese knotweed in bloom. I don't have GPS coordinates, but it's to the left of the school if you're sitting on the hillside watching the swifts. It's pretty hard to miss.

Expert Reviewer

Tania Siemens
WISE Program Coordinator (Watershed and Invasive Species Education)
Oregon Sea Grant Extension
Oregon State University
tania.siemens@oregonstate.edu
541-914-0701

© 2024 Portland State University | Contact us for questions regarding site content