My other bush of Rhodys, taken today, I'm on top of the steps, it's about 6 ft. I've cut them back each year, they were huge when I moved in. Not good to have huge bushes near the house if there's a bushfire. The first bush has finished flowering. It's a hotter pink.

Callistemons and grevilleas are tough and have lovely flowers, as well. Kangaroo paws in between could look nice, and myoporum parvifolium underneath will keep the weeds down. They should all cope with your climate, but wander around the neighbourhood, look at what is in the nursery, talk to the nursery staff (especially the older or more knowledgeable ones).

Gum trees are provide a stunning canopy to any garden, but as with any large tree close to your home, you need to be mindful of its health and possible future limb failure. Sudden limb failure in Eucalypts is the result of periods of dry weather, impacts on a tree's root zone and subsequent moisture stress. I recommend creating a beautiful native garden in this area with groundcovers and grasses that are suited to the sunlight available. Make sure the area is properly mulched (organic mulch is best) and that you water the area during periods of hot weather. It's also worthwhile having an arborist look at the tree every 12 months of so to make sure it is still healthy.

Strong geometry, cool blue and glass and a plain lawn background. to fill the diamond with bush is going to cancel out its strength. But something different to the slightly sterile design compilation … if the finance is there, get two or three massive raw rock slabs and one spectacular architectural tree. resist going vertical .. layer them horizontally to slightly overlap or break the hard lines of the diamond, but not to obscure it. Then choose you vertical with a sculptural tree. There are vertical cherry trees with spectacular autumn colour which would contrast with the rocks (texturally), and be floaty like the water in the pool…. whatever the tree, lift the foliage up from the soil level, and underplant with jut one kind of tight low ground cover, even moss (if your climate can support) or ground hugging juniper that you can train inside the diamond. This combination of elements is rich for the eye, softens the geometry, and adds interest which is lacking right now. The place for shrubs and grasses and palms is to border the lawn.