"Say ‘Hello!’ to the plane tree" is said when someone wants to express his belief that something is very unlikely to happen, at least in the near future. It denotes doubt and lack of probability. Another translation may be: “My greetings to the plane tree!” or -my favourite one- “Remember me to those sitting under the plane tree” (= my fellow villagers)
There several versions regarding the origin of this proverbial phrase.
Here are two of the most famous ones:
(1) During the Turkish occupation, near the Kyrristus Monument, called “Aerides”, below the Acropolis in Athens, there was that Muslim Teaching School, which was founded in 1721 by Mehmet Fahri. When the Turks left Greece, the building was repaired by Hans Christian Hansen’s * and, then, it served as a prison. There were imprisoned many political dissenters, among them the well-known and highly respected General Makrygiannis. In the prison courtyard there was a plane tree on which the condemned t