Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on May 8, 2008

Submitter has sample

Description of specimen

Large stand of plants that appear to be similar to bamboo. Stalk of plant is reddish green with knee joints at various lenghts. Leaves are green and triangular shaped. Tallest plants are about 8 feet high. Plants have not bloomed yet.
my yard behind my fence


Dear Lisa,

Thanks for reporting knotweed. Yes, this is a very aggressive invader that is taking a foot hold in Oregon. Unfortunately it is quite abundant in the Portland area. I would recommend controlling your patch before it spreads further. You can consult the following link for control guidlines.

You may also want to find out who owns the adjacent property to inform them of the problem and perhaps offer to help them control it.

Good luck!

The Nature Conservancy EDRR Program Coordinator

Tania Siemens
May 9, 2008, 1:03 p.m.