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. [url=http://www.amazon.co.uk/Where-Do-Camels-Belong-invasive-ebook/dp/B00IEDT5AG/]Ken Thompson [/url]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.