Orange trees were grown in Southeast Asia since ancient times.
When first introduced in Europe, oranges were used only for medicinal purposes, mainly due to their exorbitant prices.
Valencia Orange has an exclamatory attribute to go green even after ripening because their peel has a tendency to re-absorb chlorophyll in warm climate. It goes green but its taste is same as that of ripe orange.
Today, they are one of the most sought-after fruits of the world, not only for their taste, but also for their nutritional value.