In minhogei Maharil it says that you should hide the spent hoshanos until Pesach and throw them into the oven. Reason is that they have a leftover kedusha and shouldn’t be demeaned by using them for any purpose. The Mechaber says that we should be careful not to step on the hoshanos after using them. He also says that they’re muktza all day. Therefore the minhag has become widespread as an answer to all this to throw them on the aron kodesh where they’ll remain safe until Pesach. In the past each shul would bake its own matzos so it was no problem to save the hoshanos on the arom kodesh until Pesach and then use them in the oven, as the Maharil says. The lulav bunch and esrog are not muktza all day because they can still be used. And the minhag with them is to put the lulav on the door to watch over the house and to make the esrog into jam for Tu B’Shvat.
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