Be aware that artificial turf can get very hot underfoot. You could lay a narrow old brick or limestone paver path to clothes line for easy access and plant ground covers or low profile herbs (eg.oregano and thyme) to use in cooking. Hardy herbs or flowers such as rosemary, lavender, geraniums against the edges of the space toward the back. Even add some large long troughs of flowers on the retaining wall to pretty up the area. It looks like it could get quite warm there but maybe a jasmine or similar climber to climb up a frame attached to the part of the large wall where there is no clothes line. Good luck, it will be a lovely space I'm sure once you get started.

Thank you all for your comments. Well, it's been a few months since my original post and we have since finished putting up the retaining wall and planting the hedge. We decided to go ahead with Murrayas - planted about 34-40 cm apart. I gave them a good trim about a week after planting at the end of Autumn and another quick trim at the start of Spring. They have really filled out in warm weather and I think the gaps between individual plants should close by the start of winter. I'm really happy with the choice - the hedge looks glossy and lush and the sweet smell of Murraya flowers is just beautiful. We didn't do any underplanting, but I'm still thinking about putting in the dwarf agapanthus for the inside border. A couple of weeks ago we planted some Rhaphiolepis "Snow Maiden" and Rhoeo along one side of the retaining wall to provide a border for a footpath and I'm really happy how it turned out.

And to answer your question I'd use wire mainly because painting trellis belongs in one of hell's circles.

Every year I buy more bulbs to pot in various combinations. I bring the best ones inside when they're at their flowering peak. Grape Hyacinths and tiny daffodils with white and red freesias are my favourites so far. I love the scent of freesias, the brightness of daffodils, and the intricacy of ranunculus. I want to plant a big oblong tub of Ranunculus this year.