Iris ensata Worlds Delight - Japanese Water Iris

They like a moist and marshy soil, without limestone. They also accept a fresh soil, even if it is not waterlogged, provided that it does not dry out in summer. On the other hand, they prefer a rather dry soil in winter. At Le Clos, we have planted them near an artificial stream whose water level is kept high during the summer. In winter, we let the level drop by about 15cm (6in), so that the stumps are above the water, as in nature where the level of rivers decreases in winter and rises in spring with the melting of snow. Their resistance to cold is excellent up to about -12°C (10.4°F). It is further increased if the soil is dry.