One of the greatest threats to the Australian environment is invasive plant species, or weeds. In central Australia, a war is being waged against the spread of Buffel Grass, which is outcompeting native plant species and changing ecosystems. In northern Australia, a similar battle is being fought against Gamba Grass, which reduces moisture and nutrients of soil, decreasing tree cover and increasing the intensity of wild fires.

Weeds can be controlled through intensive management.

Over 85 per cent of ranger groups are undertaking weed management work.