I've previously posted these images, but maybe they will be useful? I have Daylilies, Greek Oregano, Coreopsis, Lemon Thyme, Trailing Lavender Lantana, Asclepias tuberosa, Roses, Sedum, Peonies, Orange Balsam Thyme, Dianthus, Clematis, Baptisia, Echinaceas, Golden Oregano, dwarf Cannas, Salvia greggi...and some more stuff I can't remember mixed in and around the Iris.
The only thing I avoid is putting in water hogs--at all, really--but none near the Iris.
My front yard in March of 2016.
Looking from the house to the street in April of this year.