Iris sibirica (Mixed Colors) (Siberian Iris)
Of all the irises I have grown, Siberians are my favorite. I like their wide array of colors, their almost regal grace, and their grass-like foliage. Better than that, they can go almost forever without having to be divided, and they are drought tolerant and, despite their fragile appearance, are quite rugged. These irises grow from two to three feet high in sun. Zones 3-9.