What is the best depth to overwinter hardy water lilies?

Hardy water lilies overwinter best when placed eighteen to thirty six inches below the pond surface, below typical winter ice thickness. This depth provides stable, cold water temperatures that prevent freezing but keep plants dormant. Using a submerged container or a buried stock tank in the pond’s deepest section creates a safe winter zone. Avoid shallow spots that freeze solid, which can kill lilies. Proper staging helps lilies emerge vibrant in spring.