I cleaned out the area to the right of the bottom of our driveway. There's been some scrub weeds growing there, and they bloom, but I don't find them attractive. So this spring I pulled them out and replanted that area. I sent what I pulled out and raked out and raked up, etc. back to the compost pile.
The stuff I pulled out resprouted. Vigorously.
I sprayed it with Roundup. It declined to die. A seed of worry began to germinate in the back of my brain.
I sprayed it again two weeks later. It's ailing, but not dead. This afternoon I decided to try to look it up. Japanese knotweed. Listed by the World Conservation Union as one of the world's 100 worst invasive species. And *I* sent all the crap I dug up back to the compost pile on another part of the property. Which means that I've established it back there. And that pile is HUGE at this point. Looks like l need to start monitoring it.
Perhaps you should all buy stock in RoundUp. I think that I'm going to be going through a lot of it.