Land Plants - invasive

Knotweed (Fallopia sp.) on Jul 26, 2008

Originally reported as Japanese Knotweed (Fallopia japonica)

Submitter does not have a specimen

Description of specimen

I am a member of WHUUF which is next door to this property. We have one clump on our property which is under control. The owner refuses to let us cross a low chain link fence to battle a grove of these monsters that are on their side of the fence. We are spending most of our monthly work party trying to keep the shoots that come under the fence under control. It will be seeding before long. Please notify the owners as they know not what they do. They LIKE the plant!


Dear Roger,

Thanks for using the hotline! I’ll forward your report to the West Multnomah SWCD who’s staff are experts in raising awareness amongst private land owners about the need to control invasives species on their property.

I apologize for the very long delay in replying to your report. We have had a few bugs to work out since we launched the hotline and are working through them. I hope you keep on reporting!

Tania Siemens
OSU Sea Grant/The Nature Conservancy

Tania Siemens
Aug. 22, 2008, 11:07 a.m.

Dear Roger Waitt,

Can you please confirm that 8530 SW Washington Drive is the address where the knotweed infestation that you reported in located? Lacey Townsend, Resource Technician at the Tualatin Soil and Water Conservation District would like to send the land owner some information about knotweed. If possible, please contact Lacey directly at 503-648-3174 ext. 102 or with the specific address or to discuss knotweed issues further. Otherwise feel free to contact me at

Thanks again for reporting!


Tania Siemens
Sept. 3, 2008, 2:36 p.m.

A year has gone by and the problem persists. What action has been taken? I've spent many an hour over the past year taking care of our side of the fence, but, as you can see (if I can figure out how to upload my picture) there's been nothing done on the other side and it is now sowing seeds again.

Sept. 15, 2009, 5:18 p.m.