There's a lot of this wildflower coming out in places on a local walk at the moment. I've got a bit in a dark corner (the start of a woody pruning pile is behind it) - nothing much else grows there so I've left it, as although it's not showy it's nice foliage and quite elegant imo. It's been there a couple of years without spreading unduly so I've decided it's not a weed.
It looks as though it might have cultivated cousins but I'm darned if I can think what it might be...any idea please?