There are three species of Needle Grass, Nassella spp., along with Espartillo, Amelichloa caudata, found in the Castlemaine area. All are highly invasive and should be reported to the relevant authorities. Chilean Needle Grass, N. neesiana is a declared noxious weed and classed as a restricted weed across Victoria. Volunteers from the Castlemaine Field Naturalists Club have been working to eradicate these weeds from the Castlemaine Botanic Gardens and along streets throughout the town. This poster provides information about needle grasses in general and you can find more specific information about Chilean Needle Grass in this brochure or from Agriculture Victoria.
This information has been reposted from https://castlemainefieldnaturalists.org.au/important-weeds/

Chilean Needle Grass, Nassella neesiana. Photo: Euan Moore