African Boxthorn - Lycium ferocissimum

Introduced as a garden or hedge plant in the mid 1800s. Now a serious weed, particularly on neglected land in arid temperate Australia. May produce thickets that become refuges for feral animals.... more

African Lovegrass - Eragrostis curvula

A variable species complex. Valued for soil conservation and fodder or regarded as a serious weed. Introduced for soil stabilisation. Common on sandy soils; capable of resisting drought and heavy grazing. Successfully competes with low grow... more

African daisy - Senecio pterophorus

Introduced to SA at Port Lincoln in ballast, in about 1930. Now well established in the Eyre Peninsula, the Adelaide Hills and south-eastern SA and present and increasing in Victoria and NSW. Cultivated as an ornamental. Readily invades are... more

African olive - Olea europaea subspecies cuspidata

A locally common weed of roadsides, neglected land and stream banks. African Olive produces fruit that are usually smaller and less fleshy than those of plants cultivated for edible olives and olive oil.... more

Aleppo pine - Pinus halepensis

Aleppo pine is a spreading evergreen tree up to 20m tall with silvery grey bark. The relatively short trunk forms many branches. Abundant woody cones release large numbers of windblown seeds which may spread long distances.

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Algaroba - Prosopis pallida

Widespread across northern inland Australia. Forms dense thorny thickets and displaces other plants. Stout thorns injure animals while thickets restrict access to water and hinder mustering. Deep rooted and survives long periods of drought.... more

Alligator Flag - Thalia geniculata

Grows in ponds, roadside ditches, swamps and the edges of lakes, dams and other water courses. Plants are not salt tolerant.... more

Alligator Weed - Alternanthera philoxeroides

Amongst the worst aquatic weed threats in Australia. Adapted to growing on damp land, occasionally flooded land, in shallow water (rooted in the substrate), attached to the bank (in deep water) or free floating. Will survive for a few days ... more

Annual Ragweed - Ambrosia artemisiifolia

Weed of roadsides, wastelands and occasionally cultivation. Major cause of allergy with pollen causing flu-like symptoms; contact with the plant can also cause skin allergies. The stem-galling moth, Epiblema strenuana, introduced for... more

Apple of Sodom - Solanum linnaeanum

First collected in Australia in 1801. Now mainly found in coastal areas, often associated with sandy calcareous soils. Minor weed of disturbed areas, especially roadsides and in rough pastures. Not eaten by stock. Fruits are poisonous to st... more