Common pampas grass 

Pampas grass

Pampas Grass is a large, long-lived, perennial tussock grass more than two metres high with prolific fluffy seed heads (up to three metres high). It is common in open, sunny places with damp soils and on disturbed sites. Sharp, cutting bluish-green leaves grow up to two metres long. Flowers occur in summer, developing well above the foliage in two sex forms on separate plants. Female flowers are white and fluffy, while bisexual flowers are yellow, pale pink or pale mauve and almost hairless. Each plume produces up to 100,000 seeds in late summer/autumn and up to 50 plumes can occur […]


Johnson grass

Johnson grass, a coarse perennial grass, produces large, scaly rootstocks and grows in dense stands up to two metres high. This plant commonly grows in fields and roadsides and is a pest in sugar cane crops. Once grown for hay, it is now classified as a noxious weed. Johnson grass can be toxic to stock when young. Stems grow up to two metres in height. Leaf blades are up to 50 mm wide and have prominent mid ribs. Seed heads are large and loose. Seeds are smaller than sorghum seeds Seeds attach to hair or fur. They may also be […]

Serrated Tussock infestation 

Serrated tussock

Serrated tussock (formerly Stipa trichotoma) is a large, long-lived tussock grass about 50 cm high and 15 cm to 25 cm diameter at the base. Mature plants have drooping leaves that may extend plant diameter to 75 cm. Stems are much-branched, initially erect and up to 95 cm long, twice as long as the leaves. They droop at maturity to touch the ground and have shallot-like bases. The many leaves are thin, fine, 0.5 mm in diameter and up to 50 cm long. They are tightly rolled, appearing circular in cross-section, with small serrations. The leaves are green in summer, […]


Chilean needle grass

Chilean needle grass, named for its long, pointed seeds, is a perennial tussock forming grass which grows in dense clumps to one metre high. It is closely related to serrated tussock (Nassella trichotoma) and is a Weed of National Significance (WoNS). Chilean needle grass affects sown pasture and native grasslands of south-eastern Australia. It is relatively unpalatable and reduces farm productivity by displacing more desirable pasture species. Heavy infestations can decrease productivity by as much as 50 per cent during summer. It also injures stock and downgrades wool, skins and hides with its long, sharp seeds. Chilean needle grass is […]

giant rat's tail grass 

Giant rat’s tail grass

Giant rat’s tail grass is a tufted perennial to about 1.8 metres tall. It occurs as a weed in pastures and bushland areas, particularly on poorer soils. It produces leaf blades that are tough and difficult for cattle to graze, leading to reduced feed intake and reduced animal production. The seed heads are generally a ‘rat’s tail’ like spike when young and may branch to an elongated pyramidal shape when mature. Giant rat’s tail grass is native to Africa. Its seed is orange-brown, tapered-cylindrical, about 1 mm long. Roots are fibrous. The grass has a dense branched panicle up to […]

hymenachne close-up 


Hymenachne  is a semi-aquatic perennial grass that has become a major weed of wetlands, flood plains and sugar cane crops of northern Australia. Originally introduced to Queensland and the Northern Territory as a ponded pasture species, it has invaded freshwater wetlands, flood plains and river banks. It forms dense infestations, displaces native plant species, reduces biodiversity and threatens native wetland habitat. Native to the tropics of South and Central America, it is a serious weed in Australia, the West Indies, Indonesia, the Florida wetlands of USA and Suriname. Once considered a source of dry season fodder for cattle, it has […]

giant parramatta grass 

Giant Parramatta Grass

Weedy Sporobolus grasses such as Giant Parramatta Grass (GPG) and Giant Rats Tail Grass (GRTG) are aggressive weeds that significantly threaten a range of agricultural industries within the NSW North Coast region and many other parts of Australia. They also have significant impacts on the environment, recreation and tourism. GPG has invaded large areas of pasture in the region whilst GRTG is currently spreading. sporobolus_rcp