You may be able to buy Iris pumila in pots from a perennials nursery or garden center in spring. Here are pics of Iris pumila 'Alba' flowering with an Aubrieta, and Iris pumila 'Atroviolacea' flowering with Tulip batalini.
These irises need more space than the bulbous ones, and you need to watch out that their rhizomes don't crowd neighboring plants.
