Sukkot is the first of Judaism's Three Pilgrimage Festivals, the second being Passover and the third being Shavuot. Is is celebrated in autumn, on the 15th day of the month of Tishrei (late September to late October)....

"On the first day you are to take choice fruit from the trees, and palm fronds, leafy branches and poplars, and rejoice before the Lord your God for seven days. Celebrate this as a festival to the Lord for seven days each year....

The holiday's third mitzvah calls for blessing over the Four Species: Lulav, a green, closed frond from a palm tree; Hadass, a leaved branch from the myrtle tree; Aravah, a branch from the willow tree; and Etrog, a fruit of a citron tree.