From the Super Mario Wiki, the Mario encyclopedia
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A Bean Fruit is a small purple fruit that grows underground in Mario & Luigi: Superstar Saga. They bear a resemblance to the Apples from Super Mario World 2: Yoshi's Island except for their color. Another fruit that looks like it are the Pink Berries from Super Mario World.
At one point in the game, the Beanstar splits into four pieces that Mario and Luigi must recover. They find one piece in possession of Boddle who runs the Yoshi Theater. Boddle has decorated his sign with the Beanstar piece, and will not give it to Mario and Luigi unless they bring him seven Neon Eggs. Fava tells the Mario brothers that Yoshis produce Neon Eggs when fed Bean Fruit. They set off to find seven Bean Fruits to feed the seven hungry Yoshis inside the theater. Each Bean Fruit grows underneath a circle of flowers in Beanbean Fields. By speaking to Fava in the theater, the general locations of the Bean Fruits are marked on the map. Upon successfully digging up all seven Bean Fruits, and Luigi having even fought a Piranha Bean alone for one, they feed the fruits to the Yoshis and receive the Neon Eggs. Boddle places them on his sign and gives the brothers the Beanstar piece.
The Bean Fruits can be dug up at any point in the game after the Luigi Dunk move is unlocked, even though two of them are obstructed by rocks that can only be broken with the Super Hammer, and the one eaten by the Piranha Bean will not appear until after learning about the Bean Fruits.
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