We are on a sloping block. From the back boundary fence there is a retained garden bed that is 1.6 metres wide (1600) and at its highest point about 800 high from the grassed area.

_____________________________________________Boundary Fence
////////////////////////////////////////////
////////Retained garden bed ////////////////
////////////////////////////////////////////
=============================================RETAINING WALL
GRASSED
AREA

I would like to plant something there that is an evergreen, about 4 metres high and low maintenance. I want something that I dont need to prune. I was advised by a local nursery to plant acmena smithii (lilly pilly's) and did that, but feel I was given a bum steer cause I have have to hire scaffold to prune them safely as they would grow more than 4 metres if I let them go. I also have to consider my neighbours so I dont want anything that drops too many leaves / seeds etc. Nor do I want anything with a destructive root system. (Gosh, its alot of wants, isn't it? ) Sorry!

Any thoughts and ideas would be really appreciated.

Regards,
zippity-do-da