Weeds of National Significance

Weeds of National Significance (WoNS) comprise 32 species that are considered Australia's worst invasive plants. These weeds have proven social, economic and environmental impacts that occur at a scale that requires national action to manage and reduce their damage.

A national strategy for each WoNS specifies actions to better manage the weed and each of the WoNS programs is overseen by a national management committee and facilitated by a national coordinator.

The following WoNS are known to occur in South Australia:

The following WoNS are not yet established in South Australia, and are considered South Australian alert weeds based on their potential impact:

New WoNS Invasive Cacti identification posters:
•    Opuntia (PDF 4.0 MB)
•    Austrocylindropuntia & Cylindropuntia (PDF 4.0 MB)

More information

Biosecurity SA coordinates the opuntioid cacti and silverleaf nightshade. For further information contact the coordinators:

Shauna Potter
National Coordinator - Opuntioid cacti
Phone: (08) 8303 9748
Email: shauna.potter@sa.gov.au

John Heap
National Coordinator- Silverleaf nightshade
Phone: (08) 8303 9448
Email: john.heap@sa.gov.au

Further information can be found on the following websites:
Weeds.org
Weeds.gov
SA Alert Weed list

Wheel cactus (an opuntioid cacti)

Wheel cactus (an opuntioid cacti)

Silverleaf Nightshade

Silverleaf Nightshade

Bridal Creeper

Bridal Creeper