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NYMPHAEA 'King of Siam'

Image of Nymphaea 'King of Siam'

Mark A. Miller

Family

Nymphaeaceae

Botanical Name

NYMPHAEA 'King of Siam'

Plant Common Name

King of Siam Waterlily, Tropical Day-blooming Waterlily

Special Notice

This entry has yet to be reviewed and approved by L2G editors.

General Description

The day-blooming tropical waterlily ‘King of Siam’ is a true double-flowered cultivar with impressive deep blue petals. These nicely scented, flat-star flowers are held above the water surface and begin to close in the early evening around sunset. This cultivar is sterile and lacks the many anthers and stamens in the flower center. This waterlily has oval, green floating leaves with reddish purple undersides. They are supported by flexible pinkish brown stems that arise from a rhizome growing in mucky soil below.

Tropical waterlilies require full sun and sites with calm, shallow, very warm freshwater. Tender tropical cultivars, like ‘King of Siam’, should be in water that is warmer than 75 degrees Fahrenheit (24 degrees Celsius). When water temperatures drop below this point, the plant will slowly enter a dormancy by first stopping flowering, then reducing growth dramatically and eventually death if in cold water for an extended period. In late spring or summer, when water is warm, plant the rhizome directly in heavy, mucky soil or in a large submerged container filled with dense loam or clay-rich garden soil (not light potting mix). If growing tropical waterlilies in climates with very cold winters, ensure that the plant is removed from the pool before expected chilly autumn nights. In these cases plants must be grown in submerged watertight pots that can be pulled out and placed in a sunny, bright, indoor room to overwinter. This tropical cultivar is a great choice for a medium to large freshwater pool. In hot summer areas with intense sunlight, give 'King of Siam' shade in the afternoon to prevent flower petals from scalding.

Characteristics

  • AHS Heat Zone

    12 - 7

  • USDA Hardiness Zone

    9 - 15

  • Sunset Zone

    H1, H2, 1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

  • Plant Type

    Aquatics

  • Sun Exposure

    Full Sun, Partial Sun

  • Width

    4'-5' / 1.2m - 1.5m

  • Bloom Time

    Indeterminate

  • Native To

    World/Pandemic

Growing Conditions

  • Soil pH

    Neutral

  • Soil Drainage

    Poorly Drained

  • Soil type

    Clay, Loam, Sand

  • Tolerances

    Wet Site

  • Growth Rate

    Fast

  • Water Requirements

    Ample Water

  • Seasonal Interest

    Summer, Fall

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    White, Yellow, Red, Orange, Pink, Magenta, Fuchsia, Coral, Peach, Blue Violet, Ivory

  • Foliage Color (Spring)

    Green, Dark Green

  • Foliage Color (Summer)

    Green, Dark Green

  • Foliage Color (Fall)

    Green, Dark Green

  • Foliage Color (Winter)

    Green, Dark Green

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Single

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    Yes

  • Foliage Texture

    Coarse

  • Foliage Sheen

    Glossy

  • Evergreen

    Semi-Evergreen

  • Showy Bark

    No

Special Characteristics

  • Usage

    Water Gardens

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Self-Sowing

    No