Is this a plant or a weed?

[FreshsatsumaforDd]

I have two of these quite delicate plants growing in my one year old border. I have no idea what it is. It seem quite pretty though understated and seemingly non invasive so I have left them for the moment.

Any clues as to what it might be?

It's Common Fumitory - www.wildlifetrusts.org/species/fumitory, which is a weed, but quite a pretty one !

Thanks very much...how interesting to read all the ailments it was thought to cure. It can stay a little longer, but perhaps not set seed.