more advanced size,basal flare,bark maturity and smaller leaf size. Last time I was in Headland I didn't see any wild olives growing around the place,but
I did notice the place is loaded with Bougainvillea which would be a good path to follow.
If in Perth send me a PM and we'll find you an olive stump to take home.
Cheers

Pete...sorry for the slight hijack !
