It looks like a fig of some kind... the leaves are close to those of a [sacred fig](http://en.wikipedia.org/wiki/Sacred_fig), but it doesn't have the long, thin pointy end and it grows outside your region. My bet's on something closely related
– Lorem IpsumMay 12 '12 at 21:18
My guess is a quince. Do you know what colour the fruit turns when ripe? Can you cut one in half and show what it looks like? Is it hard on the inside? These questions will go a long way to identifying the plant.
– goingMay 17 '12 at 04:42