Noxious weeds

An invasive species is a species occurring, as a result of human activities, beyond its accepted normal distribution and which threatens valued environmental, agricultural or personal resources by the damage it causes.

Invasive species can have a major impact on Liverpool's environment, threatening individual species and reducing overall species abundance and diversity. For Information on pests and other threats to Australia's nature and conservation NSW Environment & Heritage -

For more information on noxious weeds please click on the following highlighted links:

Noxious weeds

A weed is a plant in the wrong place at the wrong time.  Council and the community need to work together to control weeds in our area.

The local community plays a major role in the success of our noxious weed control program.  The key aim of this program is to motivate our community to continue to learn and make informed decisions about weed prevention, containment and control.  We also rely on our community to inform us on where weeds are found within our area.

If you would like more information about noxious weed identification and management please contact council's Bushland & Weed management Officer on 9821 9504 or email

Liverpool City Council is a member of the Sydney weeds Committe. Information regarding noxious & environmental weeds can be found on their website

Why do noxious weeds need to be controlled?

Noxious weeds need to be monitored and controlled because of the potential damage they can do to the environment.

Noxious weeds can:

  • Devalue land
  • Reduce land productivity
  • Threaten biodiversity
  • Reduce the conservation value of land
  • Reduce the scientific value of land
  • Reduce the recreational value of land
  • Devalue the bushland, wetlands and rivers
  • Threaten public health.

Noxious weed management 

In accordance with the Noxious Weeds Act, 1993-Section 36, Liverpool City Council has the following functions as to the control of noxious weeds in the local government area:

"..... to develop, implement, co-ordinate and review noxious weed control policies and noxious weed control programs."

Control methods and applications

Weed control should be considered a long-term strategy and not approached as a 'quick fix' solution.  Generally weed control is most effectively managed by using a combination of control methods.

There are four main methods of weed control. The method chosen will depend upon the weed species, its location, the land use and the time of year.

Biological control

A biological agent such as an insect is used to control a particular weed, usually by eating the weed. An example of biological control in the Liverpool area is the introduction of the Alligator Flea Beetle to graze on Alligator Weed.

Mechanical control

Mechanical removal is where large machinery is used to remove large infestations of weeds in aquatic and  terrestrial situations. This includes tractors, aquatic weed harvesters, slashers, backhoes and excavators.

Physical control

Physical removal includes removal by hand or using small tools that lever or dig out weeds.

Chemical control

Chemical control is the use of herbicides to eradicate weeds. Herbicides can be applied by broadcast spray, cut and paint, cut and scrape or injection of herbicides

All declared noxious weeds in the Liverpool local government area are assigned a weed control class, in accordance with Section 7 and Section 8 of the Act.  The characteristics of each class differ depending on the threat the weed poses to human health, primary production and the environment.  Another factor that determines the class of a weed is the current distribution and potential distribution.

The following weed control classes may be applied to a plant by a weed control order:

  • Class 1, State Prohibited Weeds
  • Class 2, Regionally Prohibited Weeds
  • Class 3, Regionally Controlled Weeds
  • Class 4, Locally Controlled Weeds
  • Class 5, Restricted Plants

To view Liverpool City Council noxious weed declarations click here

Each of these classes have a different legal requirements.

Pesticide Use Notification Plan

This Pesticide Use Notification Plan (PNP) has been prepared in accordance with the
requirements of the Pesticides Regulation 1995. The plan sets out how Liverpool City Council will notify members of the community of pesticide applications it makes or allows to be made to public places it owns or controls.