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What is a Noxious Weed?


Noxious weeds are declared weeds that affect the agricultural industry, have environmental impacts, and pose a threat to human and animal health. A declared noxious weed is a weed that MUST be controlled by law.

Failure to control Noxious Weeds may result in orders to control and or fines and or legal action.

Noxious and Environmental Weeds

  • Humans are the main cause of spread of weeds of all types.
  • 65% of all weeds originated in parks, home gardens and pastures.
  • Weeds cost the Australian economy in excess of $4 billion annually.
  • The cost of weeds to the environment is inestimable.
  • Just six of our worst weeds have degraded over 20 million hectares of natural ecosystems and grazing land.

Things You Can Do To Help Minimise the Spread of Weeds

  • Maintain a healthy vigorous pasture to compete against weeds.
  • Improve your grazing management skills.
  • Dispose of garden waste responsibly; never dump it over the back fence.
  • Always cover your trailer when taking garden waste to the landfill to prevent weeds and seeds from blowing off.
  • Always harvest the fruit from plants in your plants in your yard to prevent birds and animals spreading the seeds into nearby bushland.
  • Regularly prune your garden plants after flowering, not only will this prevent seed set it will also promote healthy vigorous growth.

Complete list of Noxious Weeds for Moree Plains Shire

How we deal with them is determined by the weed control class as defined by the Noxious Weeds Act 1993.

Weed Classes

Noxious Weed Fact Sheets

Video Information


Weed Classes

Five classes support objectives of the Noxious Weeds Act:

Class 1 weeds (State prohibited weeds):  

  • present or limited distribution in NSW;  
  • plants eradicated and land kept free of plants;  
  • this is a notifiable plant;
    Examples are Parthenium weed and hymenachne.

Class 2 weeds (Regionally prohibited weeds):  

  • not present or limited distribution in regions of NSW;  
  • plants eradicated and land kept free of plants;
  • this is a notifiable plant;  
    Examples are Water hyacinth, Parkinsonia and Tropical Soda Apple

Class 3 weeds (Regionally controlled weeds):

  • not widely spread but likely to spread further;  
  • fully and continuously suppressed and destroyed; 
    Examples are Green Cestrum.

Class 4 weeds (Locally controlled weeds):

  • widely spread and likely to spread further;  
  • growth must be managed to reduce the spread and reproduction;  
  • certain plants not sold, propagated or knowingly distributed;      
    Examples are Harissia cactus, Golden Dodder, Mother-of- Millions and African Boxthorn.

Class 5 weeds (Restricted plants):

  • weeds likely to spread within or from NSW;  
  • control as per requirements for a notifiable weed;  
  • certain plants not sold, propagated or knowingly distribute
    Examples are Willows.

Noxious Weed Facts Sheets

Video Information