Yoda used his gimer stick as both a walking stick and a source of nutrients; gimer juice could be chewed out of the stick's bark, and was said to aid the Jedi Master in his meditation. This juice could keep Yoda alive for a while, were he to be without food. In his old age, Yoda also chewed on his gimer stick to release a natural anesthetic. Such canes were believed to symbolize the ancient wisdom of a Jedi Master.
At some point prior to the Battle of Kashyyyk, Yoda received a gimer staff as a gift from the Wookiees, although he left this stick behind on Kashyyyk following the execution of Order 66.
At some point during his exile on Dagobah, Yoda obtained a new gimer stick. He was in possession of this gimer stick at the time of his first encounter with Luke Skywalker, as well as at the time of his death.
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