Single bush, far out of its normal range, most likely seed deposited by bird. Have been observing for a couple of years, have not found any others nearby.
I'd image this one is probably in Tallanganda and Yanunbeyan either side of you so plenty of potential. It is a very nice record, this species is often overlooked.
@Tapirlord yeah, Tallaganda not far to the east, Yanununbeyan not far to the west, and this lone bush is just chilling on a track in some scrubby bush next to the town. Haven't yet found any in either Tallaganda or Yanununbeyan, but I've been looking! The berries on this are edible and plentiful, so it's a nice bush to have around.