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Agapanthus
Agapanthus praecox ssp. orientalis
A garden escape, Agapanthus threatens the iconic ‘Three Sisters’ in the World Heritage-listed Blue Mountains, NSW. There are also signs this popular garden plant may be spreading in cold parts of Victoria, South Australia, Tasmania and Western Australia.
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Photo: Judy Morrell; Location: Blue Mountains, NSW
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Alligator weed
Alternanthera philoxeroides
Native to South America, alligator weed invades both land and water. Thought to have arrived in ship's ballast in the 1940s, this weed smothers native plants, congests waterways and reduces water quality. It has caused the failure of small crop and turf farms in NSW.
! Weed of National Significance
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| Photo: Lalith Gunasekera, DPI Victoria; Location: Unknown |
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Arum lily
Zantedeschia aethiopica
It often comes as a surprise to people that this popular garden plant with its stunning white flower can become a serious weed. Native to South Africa, arum lily infests creeklines and wet, high rainfall areas in southern Australia. It is a particular problem in south-west WA and it was recently banned in this state.
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| Photo: Martin Pritchard, Busselton-Dunsborough Environment Centre; Location: Tuart Forest National Park, Busselton, WA |
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Asparagus fern
Asparagus scandens
A native of South Africa, asparagus fern is a vigorous groundcover with a dense, difficult to remove root mass. It has the potential to be a serious environmental weed like the closely related species, bridal creeper.
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| Photo: Sally Vidler; Location: Taree, NSW |
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Athel pine
Tamarix aphylla
Once planted as a shade tree in rural Australia, athel pine forms dense stands along inland rivers where it restricts access to cattle. High salt levels taint waterholes and prevent the growth of native species. The worst infestation occurs along 600km of the Finke River in central Australia.
! Weed of National Significance
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| Photo: Colin Wilson; Location: Finke River, NT |
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Bellyache bush
Jatropha gossypiifolia
Bellyache bush is invasive in rangeland situations across a large proportion of northern Australia and it has thrived under the recent drought conditions. A highly toxic plant, bellyache bush is unpalatable to stock leading to dense infestations at the expense of desirable pasture species. In times of drought, stock desperate for feed may eat the plants and deaths have been recorded.
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| Photo: Faiz Bebawi; Location: Southern Cross Creek, Charters Towers, Qld |
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Bitou bush
Chrysanthemoides monilifera ssp. rotundata
Closely related to boneseed, bitou bush forms dense stands on coastal dunes, displacing and threatening native flora and sheltering pests like foxes and introduced birds. A prolific seeder, bitou bush infests some 36,000 hectares (or 80%) of NSW coastline and it harbours other invasive weeds like lantana, asparagus fern and glory lily.
! Weed of National Significance
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| Photo: Rhonda James; Location: Unknown |
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Blackberry
Rubus fruticosus agg.
Dense blackberry thickets infest about 9 million hectares of temperate Australia, including native bushland, waterways and pastures. Their domination of natural environments reduces the appeal of the bush to tourists and blocks recreational access. With at least 14 different species or hybrids in Australia, blackberry is difficult and costly to control.
! Weed of National Significance
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| Photo: CSIRO Entomology; Location: Tumit Region, NSW
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Black-eyed Susan
Thunbergia alata
Be careful of how you dispose of your garden waste! Attractive this creeper may be, but it can smother the understorey and groundcover of native bushland with its dense growth. A South African native, Black-eyed Susan infests roadsides and disturbed habitats along the east coast of Qld and NSW.
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| Photo: Unknown; Location: Unknown |
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Black rolypoly
Sclerolaena muricata
Black rolypoly is native to Australia but it can become an invasive weed of pastures, as seen here in northern NSW. It is a widespread colonising species of overgrazed heavier soils.
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| Photo: Andrew Storrie; Location: Burren Junction, NSW |
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