Accidental seedling - not cultivated >10 years old
Large bush by the pond.
Tall shrub, or small tree, about 3.5 meters tall, growing on a steep E-facing embankment along Cobal Canyon Motorway, Marshall Canyon, San Gabriel Mountains. Leaves vey waxy, convex, darker green above/adaxially. Stems very hard to snap off, pretty flexible and/or tough. Bark gray. Coin used for scale is a US quarter dollar (¢25 piece), 24.26 mm, 0.955 inch in diameter.
I'm pretty sure this is an olive. Cal-IPC website says they occasionally get established in SoCal (https://www.cal-ipc.org/plants/profile/olea-europaea-profile/). I'm guessing some bird pooped a seed out here at some point.
While hiking up to chanity flats, i was able to spot this specie at a high elevation in a hot day.
In paperbark trees in east side of Geebong Park, Geebung. There are numerous hollows in these old paperbarks and the lorikeets nest there.