Love capers but don't know much about them as a plant. I didn't realise there were native Australian varieties as well, but called a wild orange (or pomegranate).
Caper. Wiki Commons
Be interesting to see how capers go in the Perth humidity. At least they require little water (once established anyhow) and a bit of compost love every so often. Now to find a nice spot in the backyard for it.
Will keep you posted!