The slaughter of the balsam

I've blipped about this before, I know. Himalayan balsam is an invasive species that is rampant near me. There is a path near my house that was almost completely taken over by it. I cleared a patch, and then I noticed someone else had done a stretch. I cleared some more, and then another patch went. Between me and this mystery person we've nearly cleared it all, so it wouldn't take much if everyone just pulled up a bit as they walked past. Ken Thompson makes the argument you can't really win against invasive species and it's difficult to say what one is anyway, but it seems worth the small effort.