This large rhizomatous plant grows 60 to 90 cm tall. It has very long, narrow, stiff leaves. The flowers, which vary in number, are very large, up to 8 to 10 cm in diameter. The petals and the sepals (which hold the petals), are purplish-blue striped with yellow, green and white. The sepals are twice as large as the petals, and have broad tips. This iris grows in colonies.