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| Category: Aquatic Plant |
| Family: Nymphaeaceae (Waterlilies) |
| Origin: North America |
| California Native (Plant List): Yes |
| Flower Color: Yellow |
| Bloomtime: Summer |
| Synonyms: [Nuphar lutea ssp. polysepala] |
| Height: Prostrate |
| Width: 3-5 feet |
| Exposure: Full Sun |
| Irrigation (H2O Info): Aquatic |
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Nuphar polysepalum (Aquatic) (Spatter-dock) - A native Western US aquatic perennial with stout, creeping rhizomes from which the leaves, on long petioles arise. In early spring the foliage of this plant is submerged and somewhat translucent, looking like lettuce at the pond bottom. In late spring the up to 1 foot wide rounded leaves are at the water surface, with some floating flat with others erect. From May to August emerge the round 10 inch wide flowers, composed of 6 yellow sepals, sometimes reddish tinged that cup around the center of the flower and hide numerous inconspicuous yellow petals and the red stamens that surround the large developing fruit. Although it can grow in water up to 12 feet deep Nuphar is more often found in shallow water (3-9 feet deep) in ponds, lakes, swamps, slow moving rivers, canals and ditches where it spreads by rhizomes and can form almost pure stands and may exclude other plant species. Seeds and rhizomes were eaten by North American Indians and are a food source for mammals and waterfowl. The foliage provides spawning habitat for fish. Plants also are cultivated for the fruits which are sometimes used in dried plant decorations. Also known as Yellow Pond Lily or Cow Lily. The genus name was derived from the Arabic word for water lilies, nailufar, which was converted in the Middle Ages to nenuphar, then to nuphar. We grew this plant form 2005 to 2008.
This information about Nuphar polysepalum (Aquatic) displayed is based on research conducted in our horticultural library and from reliable online resources. We also will relate observations made about it as it grows in our nursery gardens and other gardens we have visited, as well how the crops have performed in containers in our nursery field. We will also incorporate comments that we receive from others and we welcome hearing from anyone with additional information, particularly if they can share any cultural information that would aid others in growing it.
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