Shulchan Aruch and Rama, Orech Chaim 664:9
1 א
שולחן ערוך אורח חיים סימן תרסד סעיף ט
2ב
יש מי שאומר שאסור ליהנות מן הערבה לאחר נטילתה,אם לא התנה עליה מעיקרא דלכולא יומא אתקצאי למצותה. הגה: ונהגו להצניע ההושענות לאפיית מצות, כדי לעשות בה מצוה
There is an authority who says that one is forbidden to benefit from the willow branch after it has been used in fulfillment of the mitzvah, unless a stipulation was made at the outset to the contrary. He reasons that it will have been set aside for the entire day to serve for the mitzvah. Gloss of the Rama: It is the practice to put away the hoshanos [willow branches] to be used for the baking of matzos, in order to perform a mitzvah with them. [Translated by Rabbi Aviel Orenstein]
3 ג

Suggested Discussion Questions:

This source puts limits on our use of holy objects. What other kinds of limits should we put on our consumption?

How can we relate this text to our everyday lives?

4 ד
Time Period: Medieval (Geonim through the 16th Century)