If you do, the pond must achieve its natural balance all over again. Their starlike flowers are bright and magical as they float serenely on the water's surface. I grow tropical and hardy water lilies. Most flowers are lavender, purple, or fluorescent pink. Some bloom at night.
Most tropical lilies spread widely.
In my garden, this variety stays in the pool all year. I repot them only every few years because they don't spread like the hardy lilies, though they bloom just as profusely. Where winters are cold, treat tropicals as annuals. These plants are hardy from zones 3 to 11, but whether you must move them indoors depends on the pond or container they're planted in and the extremes of cold in your area. In milder cold regions, a deicer that you float in the water and plug into an electric outlet will keep the water from freezing.