Professor Claude Louisiana Iris Potted REGULAR Iris sp. Professor Claude Louisiana Water Iris Grows 2' to 3' Professor Claude water iris, red-violet Flowers April, May Keep the water even with the top of the pot but no more than 4 inches of water over the top of the pot Hardy zones 4 or higher Louisiana Iris can be potted, or the rooted ends tucked into the rocks of a streambed or water fall. Iris do very well soil-less read how. Your pond will stay much cleaner if you don't plant in dirt