Description Iris ‘Black Gamecock’ (La) Water Iris. An erect, clump-forming perennial which has narrow, green, drooping foliage. From May to July (sometimes again in September) large, deep purple flowers are borne. Grow in moist to wet or boggy, humus-rich soil in full sun or partial shade. It will reach a height of 90cm and a spread of 40cm.
