Jamieson, Fausset and Brown on 1 Kings 4:25

25. every man under his vine and ... fig tree--This is a common and beautiful metaphor for peace and security (Mi 4:4; Zec 3:10), founded on the practice, still common in modern Syria, of training these fruit trees up the walls and stairs of houses, so as to make a shady arbor, beneath which the people sit and relax.