Super Happy Tree
From the Super Mario Wiki
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 anyway.