White and Yellow Water Lilies have thick tubers which sprout leaves and ornamental flowers that float to the surface on narrow stems. Both types grow best in shallow, sheltered areas of 1 to 4 feet of water, with soft sediment bottoms. The white lily prefers shallower waters than the yellow. Water lilies are planted as habitat areas for fish which are attracted to the cover and the insects the plants provide. They are also very ornamental and grow a large white or yellow flower which can make shallow open water more attractive.