Noxious and environmental weeds

Noxious and environmental weeds

Noxious weeds

Noxious weeds are plants that pose a threat to agriculture, the environment or the community and have the potential to spread to other areas. The City of Sydney is responsible for ensuring noxious plants are controlled both on public and private land across the local area.

Under the Noxious Weeds Act 1993 the City has the power as the local control authority to inspect private land and issue orders for owners or occupiers to control noxious weeds. 

There are currently 5 control classes that determine how noxious weeds need to be handled:

  • Class 1: State prohibited weeds – the plant must be eradicated from the land and the land must be kept free of the plant.
  • Class 2: Regionally prohibited weeds – the plant must be eradicated from the land and the land must be kept free of the plant.
  • Class 3: Regionally controlled weeds – the plant must be fully and continuously suppressed and destroyed.
  • Class 4: Locally controlled weeds – the growth of the plant must be managed in a way that reduces its numbers, spread and incidence, and continually stops reproducing. The plant must not be sold, propagated or knowingly distributed.
  • Class 5: Restricted plants – you must comply with the notifiable weed requirements in the act.

Class 1, 2 and/or 5 noxious weeds are notifiable weeds. If you detect these noxious weeds on your property you must notify the City within 24 hours.

The Minister for Primary Industries declares noxious weeds geographically. Any particular plant may be declared across one council area, numerous council areas, a region or the entire state. Across NSW, noxious weed lists include many agricultural, bushland, aquatic, roadside and allergenic weeds. Many of these weeds are not as common and widespread in urban environments.

The Department of Primary Industries maintains a current list of declared noxious weeds across the state including identifications and appropriate control measures. You can use the site's search function to find out about declared noxious weeds across the City's local area

Environmental weeds

Traditionally, the majority of declared weeds have been agricultural weeds based on the need to protect agricultural production. Recently, the number of environmental weeds has increased on the declared noxious weeds list. 

The act was amended in 2006 to acknowledge the need to reduce the impact that some weeds have on the biodiversity and ecological integrity of vegetation and waterways across NSW. Not all environmental weeds that grow in the City are currently declared noxious, but we may recommend their inclusion at a future date.

Links

Noxious weed declarations Noxious Weeds Act 1993 Weed control order 2014

Control classes

These examples show some of the noxious weeds that can be found across the City of Sydney local area. The Department of Primary Industries maintains a complete list of declared noxious weeds across the City and other local control areas in NSW.

Class 1 – State Prohibited Weeds

Horsetail, source: NSW Department of Primary Industries
Horsetail (Equisetum spp.)

Parthenium, source: NSW Department of Primary Industries
Parthenium weed (Parthenium hysterophorus)

Siam weed, source: NSW Department of Primary Industries
Siam weed (Chromolaena odorata)


 

Class 2 – Regionally prohibited weeds

Water hyacinth, source: NSW Department of Primary Industries
Water hyacinth (Eichhornia crassipes)

Salvinia, source: NSW Department of Primary Industries
Salvinia (Salvinia molesta)

Kudzu, source: NSW Department of Primary Industries
Kudzu (Pueraria lobata)


 

Class 3 – Regionally controlled weeds

Alligator weed, source: NSW Department of Primary Industries
Alligator weed (Alternanthera philoxeroides)

Bitou bush / Boneseed, source: NSW Department of Primary Industries
Bitou bush / Boneseed (Chrysanthemoides monilifera subspecies rotundata)

Green cestrum, source: NSW Department of Primary Industries
Green cestrum (Chromolaena odorata)

Pampas grass, source: NSW Department of Primary Industries
Pampas grass(Cortaderia species)

 

Class 4 – Locally controlled weeds

Blackberry, source: NSW Department of Primary Industries
Blackberry (Rubus fruticosus agg. species)

Bridal creeper, source: NSW Department of Primary Industries
Bridal creeper (Asparagus asparagoides)

Castor oil plant, source: NSW Department of Primary Industries
Castor oil plant (Ricinus communis)

Chilean needle grass, source: NSW Department of Primary Industries
Chilean needle grass (Nassella neesiana)

Chinese celtis, source: NSW Department of Primary Industries
Chinese celtis (celtis sinensis)

Harrisia cactus, source: NSW Department of Primary Industries
Harrisia cactus (Harrisia species)

Lantana (Red-flowered), source: NSW Department of Primary Industries
Lantana (Red-flowered)(Lantana camara)

Lantana (Pink-flowered), source: NSW Department of Primary Industries
Lantana (Pink-flowered) (Lantana camara)

Prickly pear, source: NSW Department of Primary Industries
Prickly pear (Opuntia species except O. ficus-indica)

Privet broad leaf, source: NSW Department of Primary Industries
Privet broad leaf (Ligustrum lucidum)

Privet narrow leaf, source: NSW Department of Primary Industries
Privet narrow leaf (Ligustrum sinense)

Rhizomatous Bamboo, source: NSW Department of Primary Industries
Rhizomatous Bamboo (Phyllostachys spp.)

St John’s wort, source: NSW Department of Primary Industries
St John’s wort (Hypericum perforatum)

Serrated tussock, source: NSW Department of Primary Industries
Serrated tussock(Nassella trichotoma)

Rhus tree , source: NSW Department of Primary Industries
Rhus tree (Toxicodendron succedaneum)

Rhus tree , source: NSW Department of Primary Industries
Sagittaria (Sagittaria platyphylla, previously S. graminea) and arrowhead (Sagittaria montevidensis)

Class 5 – Restricted plants

Dodder, source: NSW Department of Primary Industries
Dodder (Cuscuta spp)

Fountain grass, source: NSW Department of Primary Industries
Fountain grass (Pennisetum setaceum)



 

Images credit: NSW Department of Primary Industries (DPI)

Last updated: Wednesday, 13 August 2014