These are the fastest growing screening plants and there height. They will get between 40 cm and 1 meter of new growth a year in good growing conditions.
They are avaliable in different varieties depending on what height you would like.
Photinia robusta (hxw ) 8x8m
Pittosporum tenuifolium from 3x3m
Viburnum tinus 3x4m
Syzygium austral from 1m to 6 m
Acmena smithii. from 3m to 6 m
(Wynyabbie gem). 2×2 m