Generally speaking, native hedges are used to create some kind of privacy, to block off the sun, to create a windbreak or simply to create a more attractive view. Regarding the type, colour, and size, hedges act as a natural fence perfect for outdoor spaces like patios, gardens, backyards.
Source: https://lovelytipsblog.wordpress.com/2018/08/14/why-chose-syzygium-aussie-compact-for-small-backyard/