Denver Hardy Waterlily (Nymphaea ‘Denver’)

An extremely heavy bloomer with lots of off-white petals.


The Denver hardy waterlily will grace your pond with lots of off-white flowers all day long. The 3- to 4-inch blooms stand atop red-tinted green leaves, adding some brightness to small and medium-sized ponds. Nymphaea ‘Denver’ was hybridized in 1997 by noted horticulturalist Kirk Strawn, who listed it among his top 10 favorite waterlilies.


Waterlilies thrive placed in full sun and submerged in anywhere from 8 to 30 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. (If you bought your lily from Splash, you can wait until one month after your purchase to fertilize your plant for the first time).

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. With plenty of sunlight and fertilizer, most lilies will produce tons of new flowers from May until October in southcentral Pennsylvania (Zone 6).


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.

Overview: Cynthia Ann Waterlily (Nymphaea ‘Cynthia Ann’)
Flower ColorWhite
Bloom TimeSummer
Hardiness Zone3
ExposurePrefers Sun
Where to PlantDeep Water (8-30 inches)

Additional information



Bloom Time


Hardiness Zone





3-4 Feet


Prefers Sun

Where to Plant

Deep Water (8-30 Inches)