A clump-forming evergreen perennial related to irises, producing tufts of stiff linear to sword-shaped leaves to 30cm, the flowers borne above the leaves on wiry stems. Flowers 2-3 in a terminal cluster, with 3 large, white outer segments, the inner 3 more erect and usually coloured Grow in a sunny position in a humus-rich, moist neutral to acid soil. Partial shade is suitable when planted in a hot site.