Hi, Rich. Thanks for your email. We generally get going on our knotweed treatments in mid- to late-summer, and it's usually an herbicide treatment. Feel free to check through some of the earlier hotline reports for knotweed or drop me a line (mitch.bixby@portlandoregon.gov).

-Mitch

Mitch Bixby
May 3, 2017, 1:23 a.m.