Andropogon gayanus (Gamba Grass)

Gamba grass is a prohibited matter. It is a tall tropical grass. It forms dense patches that out-compete native species. It is a Weed of National Significance.

Gamba grass is tropical species that grows in dense stands up to 4 m high.

https://weeds.dpi.nsw.gov.au/Weeds/GambaGrass