Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on May 22, 2010

Submitter has sample
EDRR Status: Local expert notified

Description of specimen

A group of about 20 to 25 plants have been spreading over last 5 years or so.

Commentary

Would like to know best way to control/eliminate

Reporter
May 22, 2010, 3:21 a.m.

Thanks for the report, Ed. You have some options, but we've been finding that herbicide applied to leaves in Sept/Oct has been very effective; summer stem injection also seems to have potential. Fortunately, there are a handful of organizations who would be able to treat that patch, given permission from the property owner. Let's talk directly about arranging that, whether it's your property or a neighbor's, and think about treatment later this summer. Meanwhile, it's okay to let grow out.

Looking forward to talking with you.

-Mitch
mitch.bixby@portlandoregon.gov

Mitch Bixby
May 25, 2010, 3:35 a.m.