Hello Lestv,
And thank you for the questions/thoughts.
"Is it your goal to have a large bunch of one color iris in a particular space? The dwarf iris are fast growers and will make clumps quickly, but if you intend to fill a space then you may wish to get more than one as Tom suggested above."
I am looking for a clump of same color irises, in a deep color, that rebloom and be at the front of garden right next to the mail box. In Michigan I have seen these uniformed Irises at different businesses but no one knows what they are.
Any Suggestions?