Sapium Sebiferum - otherwise known as "Chinese Tallow Tree". We have four of them in back garden.
Raphiolepis Indica Alba - planted as back row of backyard garden; they should grow tall enough to cover the limestone wall and be a hearty, thick hedge.
Dietes Morrocan Beauty - planted in middle row of back garden.
Agave - planted around two trees in back garden; they frame the trees.