Posted: 25/05/2015 at 18:08
I thinks a few more pics from different angles might help. and some more info.
what are the roots like? are they spreading out and growing by root or is it seeding everywhere and creating new plants. You can tell by digging one up. If you can dig one up it tells us a lot. If you have to dig some (as opposed to one) up, it's a root spreader. An indication of size would help as well and any other features such as smell, hairyness. Anything really
I saw this one go by and I didn't immediately recognise it but expected that someone else would. Maybe everyone else thought the same