The orange is the fruit of the species Citrus. The fruit of the Citrus sinensis is considered a sweet orange.Orange trees have been the most cultivated tree fruit in the world since 1987. Orange trees are widely grown in tropical and subtropical climates for their sweet fruit. The fruit of the orange tree can be eaten fresh, or processed for its juice or fragrant peel Sweet oranges currently account for approximately 70% of citrus production. In 2010, 68.3 million metric tons of oranges were grown worldwide, production being particularly prevalent in Brazil and the US states of California and Florida.