Prioritisation process for weed management

Parks and Wildlife Service’s species-led prioritisation process assesses weeds in each region based on:

  • ecological impact
  • invasiveness
  • current distribution
  • potential distribution
  • feasibility of control

The resulting priorities focus on weeds considered to be high impact, rapidly invasive and still at a population size that can feasibly be eradicated or contained to a manageable size.

This means that weed species which are already widespread are not ranked as a high priority through this species-led process.

The next stage of the process identifies high value biodiversity assets, the weeds that pose a threat to these assets, and the sites where control will have the greatest benefit and cost effectiveness. Social, cultural and economic assets as well as good neighbour issues are considered at a later stage of the process.

See pdfWeed Prioritisation Process135.19 KBfor further details on the context and methodology of the process, including how each weed was scored.

Summaries of the species ecological impact and invasiveness rankings are provided here to help other landholders, community groups and private enterprises manage weeds that might impact on the natural environment.

Ranking summary results by Parks and Wildlife Service region

Species-led ecological impact and invasiveness ranking summary results by region. The following Excel documents can be sorted by columns to find the information you require.

Notes on using the ranking summaries

Some species that are native to specific regions of Western Australia occur on these prioritisation lists as they have shown 'weedy' tendencies outside their natural range, such as on islands in the Pilbara region. 

The prioritisation for individual weeds within a Parks and Wildlife Service region should be treated as a guide and does not diminish any other requirements of land managers or developers, such as declared plants requirements of the Biosecurity and Agriculture Management Act 2007 or Ministerial requirements under Part IV of the Environmental Protection Act 1986.

For further information or to provide feedback, contact the Weeds Program on This email address is being protected from spambots. You need JavaScript enabled to view it. or the relevant regional office.