It is customary to prepare the “four kinds” which will be used for the mitzvah of Netilat Lulav, in the Sukkah on the afternoon preceding the Chag.
The “four kinds” are prepared by binding the three hadassim (myrtle twigs) and two aravot (willow twigs) to the lulav (palm frond).
The lulav is bound together on the eve of Sukkot even if the first day of the festival falls on Shabbat (which means that the mitzvah of netilat lulav will be postponed until the next day).
For more on this topic:
- Kitzur Shulchan Aruch – Laws of Dwelling in the Sukkah
- Kitzur Shulchan Aruch – Laws of the Lulav and the other Species