USING A LULAV TO BURN CHAMETZ
ASHKENAZI Jews have the custom to use their lulav from Succot as fuel for the chametz fire. Some also use the wicks saved from Chanucah.
The idea of recycling a mitzvah prop comes from a talmudic story (Berachot 39b): Rav Ami and Rav Assi found a loaf of bread that had been used for a particular Shabbat regulation. They decided to make a blessing over the bread and eat it, reasoning, “Since one mitzvah was done with this loaf, let us do another.”
Such is the love for the commandments that these rabbis will not miss the chance to re-use something that was once crucial to a mitzvah.
Nowadays we know we cannot simply throw things away without giving a thought to where they end up. Recycling a retired lulav is a way of taking responsibility not only for how precious stuff enters our life but also for how it makes its exit.