Mine is Walker's Low catmint. Gorgeous first bloom that makes people stop to look and then continues in a more subdued manner until frost.

Mine are Coreopsis 'Moonbeam', serbian bellflower, 'May night' Salvia-if cut back after first bloom will rebloom-and Lamium. Lots of the perennial geranium family are beautiful and bloom like crazy.

Jen

I guess this is a shrub, but Annabelle hydrangeas keep their blooms all summer and you can dry them for arrangements after that.

Thanks for the suggestions. I'll pass them along to my friends,and maybe we will try some.
Irene

Should mention rudbeckias & coneflowers too.

I second the rubeckias and coneflowers (my favorite two) also coreopsis is such a fantastic performer no matter how you treat it. I've planted several new ones this year but I cannot attest to how they perform yet...hopefully I'll be pleased.

knockout rose grows just great for me, flowers all summer.