A few years ago when I was trading for Irises and receiving several that were new to me, I installed a bed for them so that I could see how they grow before trying them in the "jungle". As I saw them bloom and how well they grew, I started moving them into the garden. Typically I leave some in the nursery bed, just to be safe. Marilyn, if you ever decide to do a combination planting, you can just select from your Iris bed- it's a great way to increase your favorites and really let them shine!
Lucy, I'm glad you mentioned perennial Candytuft- that's one I often forget, but I love that bright white. I haven't had problems with burgundy Heuchera burning, but there is a bit of dappled shade and protection from late afternoon sun in those areas. Must be just right, the Irises bloom well, but several shade plants perform well there too.
Sherry, seems hybridizing work for Heuchera is totally focused on foliage- I love the old fashioned, showy flowered, varieties and would love to see more work going into them. I agree, they're the perfect foil for Iris blooms and almost any bold bloomer.
Have any of you grown Brunnera among bearded Irises? Does it bloom at the same time? I sure do love the look of it!