What is the ground cover between the hosta?

Corydalis lutea......I have a love/hate relationship with it. It is a pretty plant and looks nice with Hosta but it is a prolific producer of seed and the small seedlings grow all over. They are east to pull when young.

Thanks. I will look it up to see how it would do up here. I have a shade/sun spot that I want to fill with hosta, astilbe and such and it is sort of isolated from the other beds. Might work.