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Photo Credit: Jimmy Parker

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Photo Credit: Molly Murphy

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QUICK FACTS

  • HPRWA SCORE 26
  • FAMILY Pontederiaceae
  • CATEGORY Grasses & Groundcovers

water hyacinth (Eichhornia crassipes)

A floating plant with showy purple flowers. The Division of Forestry and Wildlife of the Hawai`i Department of Land and Natural Resources has designated this species as one of Hawai`i's Most Invasive Horticultural Plants. It is considered one of the worst aquatic weeds in the world.

  • A floating plant
  • Round,leathery,shiny leaves
  • Dark roots
  • Fleshy stems with spongy/starchy stalks
  • 1 inch to 3 feet in height
  • Showy purple (sometimes white) flowers with 6 petals
  • Fruit is a three celled capsule containing many minute seeds

Harm

  • A fast growing floating plant, one plant is capable of covering an acre in one year
  • Clogs water ways
  • Spreads vegetatively and by seed
  • Produces many seeds that can remain viable for 15 to 20 years
  • Plants can double their biomass in 6 to 18 days