Bible Question
Palm Sunday the people greeted Jesus back from the desert waving Palm Leaves WHY? from Janie

Why Wave Palm Leaves
There are a couple of explanations.

One is that it was common practice in the ancient world to welcome home a king or war hero by laying out a path of branches for him to ride/walk on – similar to rolling out the red carpet today in English speaking countries. Others suggest that Romans honored champions of the games and the military with palm branches

Another explanation is that it is a reminder of the Festival of the Booths commanded in Leviticus and Deuteronomy. For this festival the Israelites were commanded: “And you must take for yourselves on the first day the fruit of splendid trees, the fronds of palm trees and the boughs of branchy trees and poplars of the torrent valley, and you must rejoice before Jehovah your God seven days.” The palm branches were used as a mark of rejoicing. The temporary booths were a reminder that Jehovah had saved his people out of Egypt, to live in tents in the wilderness. “The alien resident and the fatherless boy and the widow” shared in this festival. All Israel were to “become nothing but joyful.”­Leviticus 23:40; Deuteronomy 16:13-15

However others believe there is no connection between this festival which occurred months after Passover and the triumphal entry into Jerusalem by Christ just before his death and resurrection.

Another interesting fact:
Why did Christ ride in on a donkey or ass? In ancient times the horse was a symbol of a warrior while the donkey symbolized peace. Christ entered Jerusalem as the Prince of Peace.