Posted: 08/10/2016 at 18:23
Walls like that are classic for fruit trees, you have to keep them pruned like the one above but it's not difficult.
You could also plant flowering climbers such as clematis and roses. But the ground would have to be dug and manured and you would have to provide supports such as horizontal wires.
Don't plant anything too close to the wall, it can be very dry as the wall shelters the ground immediately below from the rain.
It looks as though you could have a fabulous garden there.