The Christian description of I. 'Alberto Castillo' quoted by Cathy is exactly as I have experienced growing it for several years (bulbs originally from Jack Elliot). It is really a robust plant, easily the best of the several forms of this genus I have. The stems are tall, the foliage abundant and the long lasting, heavy substance flowers a beautiful, clear white and large; it makes a spectacular display for many weeks in late Winter here in N. California (in a pot). It will also open pollinate with ease. I have always kept the pots slightly damp during the dormant season (by allowing them to soak up some moisture from a saucer from time to time) more out of ignorance than for any other reason save when I saw these plants (the common species forms) growing in England, it was obvious there was some residual moisture (from rain storms) all Summer. They also get weak feedings of a balanced fertilizer in solution over their growing period. Dave Karnstedt near Santa Rosa, California