Can I trim the branches of the neighbor's tree that hang over my yard?
You have the legal right to trim tree branches up to the property line. But you may not go onto the neighbor's property or destroy the tree itself.
Deliberately Harming a Tree
In almost every state, a person who intentionally injures someone else's tree is liable to the owner for two or three times the amount of actual monetary loss. These penalties protect tree owners by providing harsh deterrents to would-be loggers.