Giant Parramatta Grass
This is a clumping grass that grows up to 1.6 metres high.
Leaves when mature are tough blades. Giant Parramatta grass looks very similar to giant rat’s tail grass and can be difficult to tell apart.
Seed heads can be up to 50 centimetres long and between 1 and 2 centimetres wide. The branches of the seed head are pressed against the axis and overlap, although lower ones generally spread at maturity.
Habitat this grass adapts to a wide range of soils and conditions, including areas with low rainfall.
Weed characteristics it is aggressive and difficult for cattle to graze, reducing pasture productivity and causes significant degradation of natural areas. It can become a serious fire hazard. It replaces more productive types of grass, especially after overgrazing or soil disturbance.
Dispersal seeds can remain viable for up to 10 years and are spread by livestock, animals, on vehicles and machinery, in hay and untested pasture seed, and by fast flowing water.
This species is a Class 2 declared plant under Queensland legislation.
How to act
Spraying with an appropriate herbicide is very effective. There are herbicides designed to target sporobolus grasses without harming other species. For scattered plants or isolated infestations hand chip, bag and removal of stool from paddock and burn. Dense infestations on arable land can be boom sprayed however ongoing treatment over a number of years is necessary. Grazing management methods can gain positive ongoing control.
Refer to Weed Control Methods.
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