Johnson Grass – An erect perennial grass to 2 m high – now probably the number one weed on Rocky Hill

Johnson grass (Sorghum halepense) probably the number one weed on Rocky Hill

An erect perennial grass to 2 m high; the seed head is purplish-brown and pyramidal.

Johnson grass is summer growing and goes brown in Wagga winters. It has rhizomes (underground stems) from which new shoots can arise. The rhizomes can be 10-20 cm deep which means it is very difficult to eradicate by mechanical means.

Johnson grass is also resistant to herbicides. It grows and spreads rapidly during wet summers. Wagga had several of these in the early 2020’s and Johnson grass is now probably the number one weed on Rocky Hill.

See also https://rockyhill.com.au/portfolio/johnson-grass/

For more images of fungi and many more of plants photographed on Kooringal’s Rocky Hill visit the Plants folder.
Images courtesy of Geoff Burrows