Balsam

It's not that himalayan balsam is it P, I had that in my garden, it was a nightmare

It is Sheilar, 'orrible stuff isn't it.

Aye, it spooked the life out of me. When I passed near it, it was shooting missiles (seeds) at me. It ended up growing all over the lawn. I had to keep going out most days pulling it out!!!

It's everywhere around here too!
I've just scored seed for I.balfourii though.