Orange trees are also selftfertile like many other citrus fruits. The fruit consists of ten to 13 segments, with juice tubes, mostly orange, sometimes yellow to red are filled. Each segment is surrounded by a thin membrane (endocarp) surrounding the whole fruit of a two-tier bowl. The inner layer of skin is white, the outer orange when ripe. In the bowl are numerous oil glands, they emit an aromatic scent. Peel and segments are deformed together, the fruit is peeled or split heavier than other citrus fruits. The central axis of the fruit is not hollow. The seeds are oval with a rough shell, inside they are white. Each seed contains a lot of embryos of different sizes.

In Europe the oranges are harvested from October (early varieties from Sevilla) to August (Valencia Lates from the area around Valencia). The most important in world trade of the product is orange juice, which mostly comes from Brazil and in the form of concentrate (syrup) is traded. Brazil is the largest orange producer in the world but still remain even when the mature fruits stay green in the tropics and during the summers in the savannah climate. During the winters in the savannah climate, in the subtropics and also in the temperate climate they are orange-yellow when ripen. We have several cultivars, including navel oranges.