"... In the Temple, if we can read our Jewish sources without regard to time frames, Hosanna hymns were recited on Sukkot, in the Fall, while holding the items commanded by Leviticus 23:40. John 12:13 explicitly refers to the palm branches. The word Hoshanna [“O’ save us”] in Psalm 118:25 came to refer to the shaking of the palm and willow branches. They were reportedly held in the hand together with myrtle branches and a citron fruit while Psalm 118:25 was sung in the Temple. The symbolism of the Sukkot species and the hymns woven about them continue to excite the poetics of Jewish ritual to the present day and a massive collection of Hosanna hymns has been preserved. The precise festival day is of no import in my view as the Jesus Entrance Procession is removed from real time narrative and reflects a distant future when the messiah will arrive in Jerusalem. The last arrival of Jesus at the Temple is the best location for the scene, whatever day it happens to be. The Passover setting is not relevant to the Entrance scene—but it is relevant to the Last Supper scene ..."

Basser, Herbert W. "Planting Christian Trees in Jewish Soil" in Avery-Peck, Alan J., and Jacob Neusner (eds.) Judaism and Christianity: New Directions for Dialogue and Understanding (pp. 61-82) Brill, 2009