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My husband and I just moved into a "new" Old Farmhouse property in Eugene. We were lucky to have an electrician call to our attention what looked like beautiful flowering trees. He warned us about the insidious nature of the Japanese Knotweed, which he identified. My son and I cut it all down, where I noticed it was very much like bamboo. I did some reading on it, and realized it was going to be tough to eradicate, but I wasn't prepared for the resurrection that occurred this spring. I know it all has to be dug out, every tiny piece of it, but it is all over the property next door, which is owned by someone out of state, and has no house on it. We are very near a creek, that I think feeds into the Willamette river. I read that 1/8" piece of root can start a whole grove of this stuff, so I am concerned. I don't even know if I can get it out of my yard, let alone the property next door. Can you give me any help with information on how to eradicate this plant. Cardboard and black plastic do not seem to curtail its reappearance. I don't use any chemical herbicides.
Thank you for your help,
Nadya and Don Carson
PS. We have included a picture attached to this eMail.