What's this ?weed

[LiteraryDevil]

This has taken over some of my containers. Any ideas what it is? It's quite pretty.

Looks a bit like white lobelia.

I don’t know what it is called but it spreads seed everywhere!

Is it chickweed? Does it look like it's spreading all over? Whatever it is get it hoiked out while the flowers are still on and it hasn't had a chance to form seeds for next year

Bitter cress she said bitterly. If it isn't yarrow , it's ground elder and now this stuff every where this year

Bitter cress, (Cardamine hirsuta). Get it out ASAP or those little thin seed pods will explode sending seeds everywhere

Its nickname is Jumping Jesus

Thank you! Definitely bitter cress! Nothing came up in searches until I had some ideas to google. I've only got pots so can't take over much. I've got it all out I think. Not seen it before this year. Don't think my rhubarb likes it!

Pull it up whenever you see it, it is a nightmare and can spread a long way. The seed pods pop and the seed flies everywhere.