Photo guide to weeds

Anchored water hyacinth (Eichhornia azurea)

  • Anchored water hyacinth
    Anchored water hyacinth stems and leaves
  • Anchored water hyacinth in water
    Anchored water hyacinth in water
  • Photo of the Anchored water hyacinth
    Anchored water hyacinth

Pest alert

If you have seen this plant, contact the Customer Service Centre.

General information

Anchored water hyacinth is an aquatic plant, native to tropical America. Anchored water hyacinth is closely related to one of the world's worst aquatic weeds, water hyacinth (Eichhornia crassipes).

Biosecurity Queensland encourages people report this Class 1 pest plant and take actions to help stop the establishment, prevent the spread, and to control this pest.


Scientific name
  • Eichhornia azurea
  • Looks similar to water hyacinth
  • Glossy round leaves, generally broad-ovate, 5-16cm long, 2-16cm wide.
  • Stems smooth and branched.
  • Flowering stems 8-12cm above water.
  • Attractive funnel shaped purple flowers with six toothed petals 1-3cm long.
  • Seeds are between 1-2mm long
  • Can survive either free-floating on the water surface or rooted into the mud.
  • Currently not known to exist in Queensland or Australia.
  • Broken fragments and seeds can spread by water.


  • Smothers the surface of creeks, lakes and other water bodies.


  • Can interfere with pumping and irrigation equipment and structures such as bridges and dams.
  • The best form of weed control is prevention. Treat weed infestations when they are small - do not allow weeds to establish.
  • Ways to prevent weed spread
Declaration details
  • A declared Class 1 species under the Land Protection (Pest and Stock Route Management) Act 2002.
  • Not commonly present or established in Queensland and has the potential to cause impacts to whole or part of the State.
  • Introduction, keeping, releasing and supplying (including supplying things containing reproductive material of this pest) is not possible without a permit, for special purposes, issued by Biosecurity Queensland.

Further information

Last updated 27 September 2012