Specifically, the flowers and the trees?
This is one of a row of street trees. I think they are cherries. But several of them have small white flowers growing from lower on their trunks. I don't think all the pink flowering branches were grafted on, or the white flowering twigs - these are trees planted between a sidewalk and the street, not something anyone cares a lot about.
Is it something do with pollen? What are the white flowers?