Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on Jun 20, 2018

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

Description of specimen

This is knotweed that the invasive weed people have worked on before. I called for help last year, but nothing was done and it has come back more aggressively this year.
Riverbank knotweed Knotweed in field across the road knotweed close to but not on the riverbank


Hi Carol,

Thanks for following up about the knotweed regrowth! Yes, I am coordinating with Clean Water Services, and their contractor should be able to spray this when they are headed over to treat knotweed on Fanno Creek (probably sometime in August). I have your phone # on this report and can call you beforehand so you'll know when they are coming. I recommend that you leave the plants as is and avoid cutting them. It's easier for the herbicide applicators to spot when they bloom in August and I'm not sure there would be enough re-growth to spray if you cut them now.

Just so you know, Tualatin SWCD will be taking over managing the invasive weed program from Clean Water Services next year, so I'll be the contact person if you need to get ahold of me.

Thanks again for reaching out! Have a great day!

Kind regards,
Tyler Pedersen
Tualatin Soil & Water Conservation District
503-334-2288 Ext 111

Tyler Pedersen
June 20, 2018, 12:50 p.m.