The fruits of the pommelo are similar to grapefruit but larger. They have, however, little gastronomic qualities. That is why this tree with large leaves and small size, originating in Polynesia, is mainly grown for its ornamental character. The presence of citrus in the medieval garden, in al-Andalus, but also in a predominantly Christian Europe, lacks any utilitarian sense, since the old bitter trees did not produce edible fruit. Its cultivation was mainly for ornamental purposes, especially the orange trees, valued more by the paradisiacal connotations that bring the color of their fruits and perfume of their flowers than for their nutritious properties. The conversion of citrus fruits in edible is due to a long process of hybridization. This capacity for grafting a species into another has resulted in an extensive list of new species, generated artificially. The citrus maximum, the pommelo, is one of the few original citrus unaltered by human action that remain today.