Answer: As aquatic plants, waterlilies grow rooted in the soil of natural bottom ponds or lakes. In an ornamental pond with a liner, they are planted in heavy soil in a container and then the container is set in the pond. The water lilies need a certain amount of water over them. In winter, the hardy ones need to be lowered below the freeze line, in summer they need some insulation from the heat. Typically they are set about 18 inches below the water surface. Tropical lilies are usually about six inches below the surface because they like the warmer water temperature there. I hope this answers your question.
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