The Super Happy Tree (sometimes known as the Marvelous Tree of Mirth) is a tree that is only found on Yoshi's Island during the events of the game, Yoshi's Story. It grows every type of fruit available on the island, including the magical Heart Fruit. It is the ultimate source of all the Yoshis' happiness on Yoshi's Island. Baby Bowser steals the Super Happy Tree for its power, but the baby Yoshis later reclaim it. Baby Bowser later claims that it tasted rotten to him anyways.
It later appears in Super Smash Bros. and Super Smash Bros. Melee in the background of a stage. It also makes a cameo in the background of Yoshi Park during Mario Superstar Baseball.