On hoshana rabbah we bang aravos on the ground.
Can one use hoshanos that one banged on the floor already or does one need his own?
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Nitei Gavriel Succah 79:5 says that it is proper not to reuse an Arava that was used already, however there is no problem Halachically.
Kovetz Halachos from Rabbi Shmuel Kamenetzky says that it is Mutar L'Chatchila to reuse so long as there are leaves remaining on the Arava.