Waterlilies thrive placed in full sun and submerged in anywhere from 6 to 20 inches of water. Put your potted lily directly into the pond, or remove it from the pot and plant it in a designated pocket. Don’t worry if the lilies’ leaves are completely submerged; any new growth will find its way to the surface.
For maximum blooms, fertilize your lilies about once per month from May until September.
Each flower on a waterlily will repeat its bloom cycle – opening in the morning and closing in the afternoon – for three to five days before dying. You’ll know a bloom has run its course when it sinks under the water, at which point you can prune it. Depending on water temperature, sunlight and fertilizer, most lilies will produce tons of new flowers from May until October.
Trim off the lily’s leaves as they start to die off for the season, eventually pruning the whole plant down to its base. Some people like to “sink” their waterlilies in the deepest part of the pond in the winter, but we have found that most hardy waterlilies manage just fine without being moved.
Waterlilies produce fewer leaves and flowers when overcrowded. To get the most out of your plant, divide it every couple years.