Chris Hogg wrote in
:

http://en.wikipedia.org/wiki/Alexanders


I am pretty sure that is it! Thanks...

Yes, I have eaten the leaves and chewed a stem, after a friend told me it
was edible. No ill effects. It tasted similar to celery.

Does anyone have any tips on how to eradicate the stuff - apart from the
usual advice of continuously hacking it off below ground level?

Jim