Known commonly as the grassy-leaved sweet flag, and is native to wetland areas of China, Japan, Korea, India, Thailand, Myanmar and the Philippines. The tufted semi-evergreen marginal aquatic perennial will grow fan-like making an attractive 'look' in the landscape. The plants will slowly spread by rhizomes, but are not considered invasive. Can be used in ponds, as they will grow fine in water. They are also used as a low groundcover. Hardy to zone 5.