Mine push up through just about any herbaceous perennial, but are particularly nice through alchemilla mollis as they flower lime green under the purple alliums, or through persicaria 'dimity' as that flowers well after the alliums are gone, extending the flower power in that spot. I also like them with large ferns, and find they tolerate a bit of shade so long as the ground isn't soggy. Pretty with paeonies and also roses. The world's your oyster really.