Introduced grasses

Since 1788, many perennial grass species have been introduced to Australia. Some species have adverse impacts on biodiversity and agriculture and are recognised as weeds. For example, the Commonwealth Government has listed serrated tussock and Chilean needlegrass as two of 20 Weeds of National Significance. In NSW, these species and pampas grass, African lovegrass and giant rat's tail grass have been listed as noxious weeds under the NSW Noxious Weeds Act.

Invasion of native plant communities by exotic perennial grasses - key threatening process listing
The NSW Scientific Committee has declared exotic perennial grasses to be a 'key threatening process' in NSW. See its reasons for making this declaration.

Introduced grasses as a key threatening process - fact sheet
This explains why the invasion of native plant communities by exotic perennial grasses has been listed as a key threatening process, and outlines the effect of the listing.