Ume Plum flowers but doesn't fruit
The tree is about 5 years old, in the ground at that location for 3 years. It flowers, but doesn't fruit. Not my tree, I'm asking on behalf of an acquaintance.
I think it's like sunset zone 20 or something like that. Glendale, ca.
Not enough chill hours? Needs cross pollinator?
Just hasn't reached maturity? Not 100% sure it is grafted.