Acacia karroo - Karoo Thorn

Considered to be useful in South Africa. One of the most widespread trees in Africa. Potentially a major woody weed in Australia. Introduced a number of times and planted at scattered locations in southern Australia as a typically African t... more

Acacia saligna - Golden wreath wattle

Golden wreath wattle is a medium-sized shrub up to 10m tall and 6m wide. The pendulous branches are often blue-grey in colour when young. Bright golden flowers borne profusely in spring develop into smooth brown pods.

It is ... more

Acetosa vesicaria - Ruby Dock

Drought resistant plant distributed through the interior of Australia. Fruits showy. It generally invades disturbed land and is common along watercourses. In arid areas it can provide some grazing for stock but contains oxalates and nitrate... more

Acetosella vulgaris - Sorrel

Widespread and common. Usually germinates in autumn or winter. Seldom grazed and may be locally dominant in temperate pastures. Contains oxalates and is suspected of poisoning stock. Also a weed of crops in temperate Australia. Has been use... more

Acroptilon repens - Creeping Knapweed

Winter dormant. Seedlings form rosettes in spring, develop a deep root system, and flower the following summer. Plants spreading by creeping roots and often forming large colonies. Weed of horticultural and cereal crops, roadsides and waste... more

Alhagi maurorum - Camel Thorn

Seeds appear to need scarification, for example by passing through a ruminant, before germination. Aerial parts die in autumn and new shoots emerge from roots in spring. Commonly found along drainage lines and in irrigated pasture. Probably... more

Alisma lanceolatum - Alisma

Thrives in shallow, slow-moving or stationary, nutrient rich water. A serious weed of rice in New South Wales.... more

Allium vineale - Crow Garlic

Autumn and spring germinating perennial. Seedlings grass-like. Serious winter growing weed of cereals and pastures in temperate Australia. It may contaminate milk, meat and grain with an onion odour. Clusters of bulbils shatter readily into... more

Alternanthera philoxeroides - Alligator Weed

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

Alternanthera pungens - Khaki weed

Major weed of warm temperate and tropical areas around the world. Stock graze young plants. Widespread in wasteland, caravan parks, orchards and recreation areas. Spines are a problem with dogs and stock but are particularly troublesome to ... more