Pistachio Tree Facts – Pistachio Tree AZ
The pistachio tree probably originated from Central Asia, where thousands of trees were found in areas known today as Iran and Afghanistan. Nowadays, it is cultivated in areas characterized by hot and dry climate, such as US (California), Lebanon, Syria, Iran, India, Turkey, South Europe and other countries of Asia and Africa. The pistachio belongs to the Anacardiaceae family. The Pistacia genus includes 11 species, but Pistacia vera is the domesticated pistachio tree that is cultivated worldwide.
The pistachio tree is deciduous, long-lived, slow-growing tree that reaches a height of 20-33 feet (6-10 meters). Pistachio tree is a dioecious tree. This means that a pistachio tree can have only male flowers (these trees are called male pistachio trees) or female flowers (the female pistachio trees). In order to set fruits, pollen from male trees must travel through the wind to female trees. Only female trees produce fruits. Consequently, if we want to harvest fruits, we must place ideally 1 male pistachio tree in the center of every 9 female pistachio trees. Male pistachio trees can be easily spotted by anyone, because they are normally higher and much more robust than the female trees.
The trunk and branches of pistachio trees have gray color, and it becomes darker over the years. The root system is strong and can reach a depth of 10 feet (3 meters) and a width of 26 feet (8 meters). The leaves are compound, with an odd number of leaflets. The shape of the leaflets is oval in males and round-shaped in females. The leaves begin to fall in November. The female trees that produced fruits lose their leaves first. Then, the female trees that did not bear fruits start to lose their leaves. The male pistachio trees lose their leaves last. The bloom usually takes place during April. In many cases, a great percentage of male flowers bloom far earlier than the female flowers. As a result, a great percentage of pollen can be lost, resulting in decrease of fruit set and production. Thus, many pistachio farmers collect the pollen from male flowers, they store it suitable conditions and they disperse it in the female trees once they have bloomed. This is called artificial pollination.
Contrary to other nuts, pistachios grow in clusters, like grapes. The pistachio tree bears fruit in shoots created the year before by ordinary buds. The tree has a tendency towards Alternate Bearing (producing a lot of fruits in one year and not many fruits in the following year). The pistachio tree can normally produce good yields from the 7th year of its age. Its productive life can reach 100 years or more.
1. Pistachio Tree Facts
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