Thanks NicF, I didn't actually mean we do have a desert although the 'lawn' is doing a pretty good job of imitating one... I suppose what I meant was that you have to be a little more choosy in your plants; certainly this year we had tomatoes and capsicums with surplus (our first year of trying them), we've got a passionfruit vine that's rather more vigorous in it's growing than we expected, a Mitre 10 reject lemongrass that won't stop growing and my favourite are the wonga wonga vines going along the back fence as well as plenty of native plants. There are lots of others that we've tried that have given up to the heat of the sun though - it's definitely gardening by trial