The vegetation of Tower Hill was originally a diverse collection of Manna Gum, Blackwood, Black Wattle, Swamp Gum and Drooping Sheoak.
Allocasuarina verticillata, the drooping sheoak, a nitrogen fixing tree species native of southeastern Australia
In South Australia, it is associated with such trees as drooping sheoak (Allocasuarina verticillata), pink gum (Eucalyptus fasciculosa), sugar gum (E. cladocalyx), messmate (E. obliqua), and shrubs such as golden wattle (Acacia pycnantha) and peach heath (Lissanthe strigosa).