I grow annual poppies around two of my butterfly bushes, the poppies are pooping out by the time the Buddleia fills out. I am ashamed to admit, even *I* can have enough poppies. Any other ideas for fill-in plants to cover the "holes" in spring/early summer till my Buddleias catch up?

I have native columbines that work well
Tickseed
Blue eyed grass ( but if you have deer...those monsters pull mine out and leave roots to the sky)