Why does it say "b'Har Merom Yisrael"?
Radak: The height of Eretz Yisrael. Yerushalayim is higher than all of Eretz Yisrael, and Eretz Yisrael is higher than all lands
What is the significance of making fruits?
Radak: It does not say so regarding Tzidkiyah, because his children died.
Why does it say "v'Hayah l'Erez Adir"?
Radak: It will be a cedar, like it used to be, like it says "Tzimras ha'Erez" (3).
Who will dwell under it?
Radak: Yisrael will dwell in its shade.
Why does it say "Tishkonah"?
Rashi: This is like Tishkonah; the Dagesh in the Nun is in place of another Nun. Radak - the Nun of the root is omitted. Birds will dwell. This is a Mashal for Yisrael, who will dwell in the shade of Zerubavel.