Nymphaea 'King of Siam'
Photo by Flickr user Utopia Aquatic

King of Siam water lily

This plant grows well in the following regions:

  • SMSierra and Coastal Mountains
  • CVCentral Valley
  • DTDesert
  • NCNorth and Central Coast
  • SCSouth Coast
Map of regions (click to enlarge)
map of California regions


The flowers of the 'King of Siam' water lily are a rich purple color, mirroring that of water hyacinth. The flowers stand about 20 cm above the water surface and get a size of 10 – 17 cm across. They open in the morning and close by sundown, during June to September. Flowers are nicely scented.

Like many hybrids the 'King of Siam' water lily is sterile, which means that the plant will not set seeds. The plant can spread vegetatively downstream, however, so it is important to be cautious about the spread of plant material in streams and waterways.

Sun needs:

  • Full sun

Water needs:

  • High water
Water needs information from WUCOLS unless otherwise noted