What is the significance of "Yelechu Yonekosav"?
Rashi citing Targum Yonasan: They will have many sons and daughters.
Malbim: These are soft branches that leave the ground by the roots; they spread. I.e. the children at the end of days are the Yonekos that arose after the first roots were stricken and ceased - they will be fresh trees that bear fruits.
What is the comparison "cha'Zayis Hodo"?
Radak: Its power of moisture will last, like an olive-tree - its leaves are moist the entire year. I.e. their good will never cease.
Malbim: Olives give oil for light. So their fruits will illuminate with Hashem's light. Just like an olive-tree's leaves are fresh in summer and winter, so their success will be constant, at all times.
How is the smell like Levanon?
Radak: "K'Rei'ach Sadeh Asher Berecho Hashem" (Bereishis 27:27). Levanon has many species of trees and herbs; some give a nice smell. The Nimshal is, their good repute will spread to afar.
Malbim: This is Kedushah and Taharah attributed to Levanon, which is in Eretz Yisrael - the place of Taharah and Kedushah.
