Azolla

Azolla weed
Azolla in local water way

Azolla is a small native free floating fern that is found in many waterways in the Campbelltown local government area.

Azolla grows from 1cm to 2.5cm wide and is a bright green colour with its colour changing to deep red when it is exposed to the sun. Azolla grows in waterways in dense patches, which can look like a green or red carpet and from a distance it may be confused with Salvinia, a noxious aquatic weed, or the scum of a bluegreen algal bloom.

Although Azolla can appear intrusive it can be highly beneficial to the aquatic environment in many ways, including:

  • improving water quality by capturing excess nutrients from the water
  • providing a food source and habitat for a variety of aquatic animals
  • discouraging algal blooms by reducing the penetration of sunlight into the water.

For further information contact Council's Natural Areas Team on 02 4645 4601 or by email to open.space@campbelltown.nsw.gov.au