Twice pinnately divided; a compound
leaf with leaflets arranged in the same
way as a feather.
A leaf whose blade is much reduced or
A narrow inflorescence with several
Eastern Hills Catchment Management
Tel: (08) 9424 2222
Shire of Mundaring Bushcare Coordinator
Tel: (08) 9290 6685
Shire of Kalamunda
Tel: (08) 9257 9936
Wattle species are native in eastern
Australia and several species have been planted in WA in gardens, timber plantations, on farms as windbreaks or in early rehabilitation works. Some of these species have become naturalised and hence, particularly invasive weeds. They are mostly colonisers of roadsides and bushland. A. decurrens and A. longifolia, invade creeklines and A. melanoxylon and A. podalyriifolia are troublesome weeds of
swamps and coastal areas.
A family of over 3, 000 species, most species have been listed for at least 25 years. The main weed species are:
• Acacia baileyana (Cootamundra
• A. iteaphylla (Flinders Range Wattle);
• A. decurrens (Black Wattle)
• A. longifolia (Sydney Golden Wattle)
• A. podalyriifolia (Queensland Silver Wattle)
• A. dealbata (Silver Wattle)
• A. melanoxylon (Blackwood)
Some species may be confused with
Acacia pentadenia (Karri Wattle).
Origin Eastern Australia.
Up to 10 m tall; bark will vary between species.
A. melanoxylon: Up to 30 m tall
Leaves: Silvery; bi-pinnate; 3-14 cm long. A.longifolia/ A.melanoxylon/ A.podalyriifolia : Undivided leaf-like
Flowers / Seedheads: Bright yellow
A.melanoxylon: Cream; in short sprays
Prolific seeders with seeds able to survive many years. Dispersed by birds, water and ants.
A.melanoxylon may from dense thickets after disturbance.
Perth; Southwest. A.Longifolia / melanoxylon : Perth-Albany A. dealbata: Perth-Albany; Karri forest in Porongurup Range.
A.podalyriifolia: Jurien Bay-Walpole.
Acacia baileyana/:A. podalyriifolia
Winter A.dealbata/decurrens/ longifolia : Late winter-spring.
A. melanoxylon: Spring
Manual Removal In large dense stands, a hot fire may be
used to kill old trees and encourage seed to germinate so they may be controlled by herbicides or manually. Hand pull seedlings, ensuring the roots are removed by using a weeding fork. Avoid further burning, as this will encourage seedling establishment. Repeat the treatment every 2-3 years to
ensure that no trees reach an age where
they can set seed.
Do not buy or plant these species in gardens.
Apply herbicides in spring or when trees are actively growing. Various herbicides and application methods for treating mature plants and juveniles.
Please see “Herbicides and Pesticides” fact sheet for more information about spraying chemicals.