The pistachio, Pistacia vera in the Anacardiaceae family, is a small tree originally from Iran, which now can also be found in to regions of Greece. Pistacia vera often is confused with other species in the genus Pistacia that are also known as pistachio. These species can be distinguished from P. vera by their geographic distributions (in the wild) and their nuts. Their nuts are much smaller, have a strong flavor of turpentine, and have a shell that is not hard. The earliest records of pistachio in English are around roughly year 1400 with the spellings "pistace" and "pistacia". The word pistachio comes from medieval Italian pistacchio, which is from classical Latin pistacium, which is from ancient Greek pistákion and pistákē, which is generally believed to be from Middle Persian, although unattested in Middle Persian. Later in Persian, the word is attested in Persian as pista. As mentioned, the tree came to the ancient Greeks from Western Asia.
Pistachio is a desert plant, and is highly tolerant of saline soil. It has been reported to grow well when irrigated with water having 3,000–4,000 ppm of soluble salts. Pistachio trees are fairly hearty in the right conditions, and can survive temperatures ranging between −10°C (14°F) in winter and 40°C (104°F) in summer. They need a sunny position and well-drained soil. Pistachio trees do poorly in conditions of high humidity, and are susceptible to root rot in winter if they get too much water and the soil is not sufficiently free draining. Long hot summers are required for proper ripening of the fruit.The bush grows up to 10 metres (33 ft) tall. It has deciduous pinnate leaves 10–20 centimeters (4–8 inches) long. The plants are dioecious, with separate male and female trees. The flowers are apetalous and unisexual, and borne in panicles. The fruit is a drupe, containing an elongated seed, which is the edible portion. The seed, commonly thought of as a nut, is a culinary nut, not a botanical nut. The fruit has a hard, whitish exterior shell. The seed has a mauvish skin and light green flesh, with a distinctive flavor. When the fruit ripens, the shell changes from green to an autumnal yellow/red and abruptly splits part way open. This is known as dehiscence, and happens with an audible pop. The splitting open is a trait that has been selected by humans. Commercial cultivars vary in how consistently they split open.
The trees are planted in orchards, and take approximately seven to ten years to reach significant production. Production is alternate bearing or biennial bearing, meaning the harvest is heavier in alternate years. Peak production is reached at approximately 20 years. Trees are usually pruned to size to make the harvest easier. One male tree produces enough pollen for eight to twelve nut-bearing females.
Harvesting in Greece is often accomplished by using shaking equipment to shake the nuts off the tree. After hulling and drying, Greek pistachios are sorted according to open mouth and closed mouth shell. Sun drying has been found to be the best method of drying. Then they are roasted or processed by special machines in order to produce Greek pistachio kernels.
Harvesting in Greece is often accomplished by using shaking equipment to shake the nuts off the tree. After hulling and drying, Greek pistachios are sorted according to open mouth and closed mouth shell. Sun drying has been found to be the best method of drying. Then they are roasted or processed by special machines in order to produce Greek pistachio kernels.
In Greece, the cultivate type of Greek pistachios are different. It has an almost white shell, excellent sweet taste, red-green kernel and a little bit more close mouth shell than "Kerman" variety. Most of the production of Greek pistachios in Greece comes from the region of Almyros.
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