The Tail Tree is a special tree which grows Super Leaves on its branches. It is located outside of Princess Peach's Castle during Super Mario 3D Land.
Mario and the three Toads (Yellow, Blue and Red) are looking for Princess Peach when they discover she and the super leafs are missing. They find a letter hovering near the Tail Tree so they decide to investigate. They find a picture of Bowser holding Princess Peach. Bowser is utilizing the leafs that he and Dry Bowser took from the Tail Tree to create False Bowsers and strengthen the Koopa Troop. At the end, Mario, the Toads and Princess Peach arrive back at the castle where the Tail Tree has sprouted new super leafs.