Egeria Control Guide

Do's and don'ts of egeria control



  • Plan your control program, this will save time and money in the long-run;
  • Consider the impact of your control methods on off-target species, especially if herbicides are used;
  • Get in early - For new infestations, eradicate before the plants reach the flowering stage: once plants begin seeding, control becomes more difficult and expensive;
  • Carefully time your use of herbicide for best results (see the Herbicides for aquatic weed control link for more information);
  • Coordinate your control program with neighbouring landholders where your weed problem crosses property boundaries;
  • Revisit and regularly inspect the site and ensure follow-up is undertaken.


  • Don't start your control program without first planning your approach;
  • Don't allow an infestation to become established. Get in early!
  • Don't rely on just one treatment: follow-up is essential.

Spread of egeria

  • Only male plants occur in Australia, and all reproduction is vegetative. Infestations of egeria increase in size when the over-wintering colony begins new growth in spring.
  • New colonies are formed when stem fragments break away from the colony in stream flow and establish downstream. Egeria also continues to be spread in the aquarium trade.

Physical removal

  • Hand pulling, cutting and digging with machinery is not effective in controlling egeria.
  • Physical removal provides only temporary reduction of an infestation, and can encourage spread of the weed by stem fragments.

Chemical control

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