A heart fruit is a fruit that cause Chao to go into Mating Season.

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Giving an adult Chao a Heart Fruit will cause it to go into its mating season (a ring of flowers will surround the chao) allowing it to breed with other adult Chao. However, if a child Chao eats this fruit, its lifespan will decrease slightly. After two chao mate they produce an egg which you can hatch and raise. However, nothing will happen if the garden you use the fruit in is full.