Declared plants

To protect Western Australian agriculture the Department of Primary Industries and Regional Development regulates harmful plants under the Biosecurity and Agriculture Management Act 2007.

Plants that are prevented entry into the State or have control or keeping requirements within the State are known as declared pests.

The Western Australian Organism List (WAOL) contains information on the area(s) in which a plant is declared and the control and keeping categories to which it has been assigned in WA.

If you need advice on declared plants please search for articles below in our website or:


  • Alligator weed (Alternanthera philoxeroides) is a declared pest in Western Australia (WA).

  • African thistle (Berkheya rigida) is a pest in Western Australia (WA). This article describes the nature of the plant.

  • African rue (Peganum harmala) is a declared pest in Western Australia (WA).

  • Several non-native acacias (Acacia species) are declared pests in Western Australia (WA).