The Bamboo Forest symbol is wild for all symbols except the Free Spins, Panda, and Lantern symbols. Every Bamboo Forest unlocks a new tile in the reels where they appear. Whenever there is at least one Bamboo Forest in the reels, it causes all reels to respin once.

Fig 1 - Bamboo Forest appeared in reel 3

Fig 2 - One reel unlocked in reel 3