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:
Biosecurity SA coordinates the opuntioid cacti and silverleaf nightshade. For further information contact the coordinators:
Wheel cactus (an opuntioid cacti)