The Routledge Dictionary of Judaism
Palm branch into which is inserted springs of willow and myrtle and which is carried together with a citron (ETROG) during synagogue worship on the festival of SUKKOT (Tabernacles) to fulfill the requirement of Leviticus 23:40: “And you shall take on the first day the fruit of goodly trees, branches of palm trees, and boughs of leafy trees, and willows of the brook; and you shall rejoice before the Lord your God seven days.” Scripture views these species as representing the bounty of the Land of Israel and so as

Lulab Lulab and etrog used during worship on Sukkot.
appropriately used in a celebration of the harvest season.
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