Note: Introduced as a garden hedge. Prolific seeder and highly invasive. Forms dense stands excluding other vegetation. Seeds long lived in soil and regenerate readily after fire. A dense stand can produce six million seeds per hectare per year. May also provide critical habitat to small native birds and animals (e.g. bandicoots) if other native shrub species absent, so may require staged program of removal. Control measures: Hand weeding, cut and paint with suitable herbicide, mowing/slashing, spot spraying, spot-burning. Dispersal: water, animals, vegetative. Large shrubs and trees Acacia baileyana, Cootamundra Wattle Threat: High threat environmental weed. Description: Small evergreen spreading tree or large bushy shrub to 10 metres tall with distinct grey foliage. Includes purple leaf hybrids. Forms dense shade excluding native understorey species. Flowers: Profuse golden ball-shaped flowers from June to September. Leaves: Feathery, divided twice, with two to six main divisions, each having 10 to 24 pairs of silvery-blue greyish or purple tinged leaflets. Glands present along leaf axis. Stems: Smooth and brown, branchlets slightly angled and furrowed, with waxy coating. Note: Spread by wind, ants over short distances, dumped garden waste, water, and contaminated soil. Can readily hybridize with several local and introduced acacia species; hybrids should also be removed. Similar indigenous species: Silver Wattle (Acacia dealbata hybrid with A.baileyana). Control measures: Hand weeding, spot spraying, cut and or drill/frill and fill with suitable herbicide, mowing/slashing. Dispersal: Ants, birds. Acacia decurrens, Early Black Wattle Threat: High threat environmental weed.
Note: Introduced as a garden hedge. Prolific seeder and highly invasive. Forms dense stands excluding other vegetation. Seeds long lived in soil and regenerate readily after fire. A dense stand can produce six million seeds per hectare per year. May also provide critical habitat to small native birds and animals (e.g. bandicoots) if other native shrub species absent, so may require staged program of removal. Control measures: Hand weeding, cut and paint with suitable herbicide, mowing/slashing, spot spraying, spot-burning. Dispersal: water, animals, vegetative. Large shrubs and trees Acacia baileyana, Cootamundra Wattle Threat: High threat environmental weed. Description: Small evergreen spreading tree or large bushy shrub to 10 metres tall with distinct grey foliage. Includes purple leaf hybrids. Forms dense shade excluding native understorey species. Flowers: Profuse golden ball-shaped flowers from June to September. Leaves: Feathery, divided twice, with two to six main divisions, each having 10 to 24 pairs of silvery-blue greyish or purple tinged leaflets. Glands present along leaf axis. Stems: Smooth and brown, branchlets slightly angled and furrowed, with waxy coating. Note: Spread by wind, ants over short distances, dumped garden waste, water, and contaminated soil. Can readily hybridize with several local and introduced acacia species; hybrids should also be removed. Similar indigenous species: Silver Wattle (Acacia dealbata hybrid with A.baileyana). Control measures: Hand weeding, spot spraying, cut and or drill/frill and fill with suitable herbicide, mowing/slashing. Dispersal: Ants, birds. Acacia decurrens, Early Black Wattle Threat: High threat environmental weed.
common_weeds_of_nillumbik_booklet.docx