Acacia Paradoxa-Common names, Hedge Wattle, Kangaroo Thorn, Prickley Wattle.
As you can see from the baby photos, there is something very 'Little Shop of Horrors' about them.
A large shrub, grows from 2 to 4 metres high.
Once declared a noxious weed by farmers, they are now being replanted. Their dense foliage and prickles make it an inpenetrable hedge. (If you want to prune it use very thick gloves). It is an excellent wind break, and a safe haven for small birds, lizards etc.
Also great for keeping the kids of the garden. They'll only tackle it once, but you might want to keep some tweezers on hand. Could also deter prowlers if planted along the fence line.
When in flower, it is covered in pretty yellow balls, and butter wouldn't melt in its mouth.
Another example of our fabulous local indigenous flora.