Iris tectorum An Easy Grower
Perhaps the best known Crested Iris is The Japanese roof Iris,
Iris tectorum. zones 5-9
It grows easily in most parts of the country and is suitable for the perennial border. It prefers some shade in the hottest areas and a soil that is not totally dry but well drained.
When it was decreed in Japan that all cultivated land must grow food, the Geishas who used its powdered rhizomes as white face paint moved it to the tops of thatched roofs giving it its name.