Roof iris has lovely, large, six inch wide blue flowers with white and purple markings. The foliage is arranged in fans of narrow, lance-shaped, ribbed, glossy, upright leaves that add a nice texture to the garden. Commonly called roof iris because it has in the past been grown on thatched roofs in both Japan and China.
Asia - China and Japan
Forest margins, sunny banks, meadows, damp places, beside water to 3500m. Grows wild on shaded rocky slopes and in scrub. Also found planted on thatched roofs in Japan and China.