The internet has lots of sources for information about knotweed. Much of it can be scary. Relatively little of it can offer answers to the kinds of questions that I find myself asking. While I can't promise to answer your particular question, I would like to share some of my favorite resources, including those I've generated myself. I hope you find them helpful, and I'm always glad to engage in the kind of hair splitting conversations that knotweed somehow always seem to generate.
This collection will grow over time. If for any reason you wish to avoid clicking anything, let me know. I'm sure I can provide the resource in an alternate format.