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PISTACIA VERA L. - Pistachio, Pistache |
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Related Species: Mt. Atlas Pistache (Pistacia atlantica), Chinese Pistache (P. chinesis), Terebinth Pistache (P. terebinthus)
Distant Affinity: Cashew (Anacardium occidentale), Mango (Mangifera indica), Ambarella (Spondias cytherea), Yellow Mombin (Spondias mombin), Red Mombin (Spondias purpurea), Imbu (Spondias tuberosa) and others.
Origin: The pistachio tree is native to western Asia and Asia Minor,from Syria to the Caucasus and Afghanistan. Archaeological evidence in Turkey indicate the nuts were being used for food as early as 7,000 B.C. The pistachio was introduced to Italy from Syria early in the first century A.D. Subsequently its cultivation spread to other Mediterranean countries. The tree was first introduced into the United States in 1854 by Charles Mason, who distributed seed for experimental plantings in California, Texas and some southern states. In 1875 a few small pistachio trees, imported from France were planted in Sonoma, Calif. In the early 1900's the U.S. Dept. of Agriculture assembled a collection of Pistacia species and pistachio nut varieties at the Plant Introduction Station in Chico, Calif. Commercial production of pistachio nuts began in the late 1970's and rapidly expanded to a major operation in the San Joaquin Valley. Other major pistachio producing areas are Iran and Turkey and to a lesser extent, Syria, IIndia, Greece, Pakistan and elsewhere.
Adaptation: Pistachios thrive in areas which have winters cool enough to break bud dormancy and hot, long summers. They are drought resistant and very tolerant of high summer temperatures, but cannot tolerate excessive dampness and high humidity. The tree has about the same cold resistance as almonds and olives but flowers later in spring than almonds. Chill requirements are estimated at 600 to 1,500 hours. In this country the pistachio is best adapted to the hot, drier regions of California and the Southwest, especially California's central valley and southern California inland areas. Pistachio trees are not particularly suitable as container plants.
DESCRIPTION
Growth Habits: The pistachio is a broad, bushy, deciduous tree which grows slowly to a height and spread of 25 to 30 feet, with one or several trunks. The trees are inclined to spread and droop, and may initially need staking. Their open habit and attractive foliage make them valuable ornamentals. Under favorable conditions pistachio trees live and produce for centuries.
Foliage: The large, grayish leaves have 3 to 5 roundish, 2 to 4 inch-long leaflets.
Flowers: Pistachios are dioecious with male and female flowers on separate trees. Male and female trees must be present for fruit to set, or a branch from a male tree may be grafted on a female tree. The small, brownish green flowers are without petals and borne on axillary racemes or panicles in early summer. Wind carries the pollen from the male to the female flowers.
Fruit: The reddish, wrinkled fruits are borne in heavy clusters somewhat like grapes. Although known as a nut, the fruit of the pistachio is botanically a drupe, the edible portion of which is the seed. The oblong kernel is about 1 inch in length and 1/2 inch in diameter and protected by a thin, ivory-colored, bony shell. Normally the shells split longitudinally along their sutures when mature. Under unfavorable conditions during nut growth, the shells may not split open. The color of the kernel varies from yellowish through shades of green, which extends throughout the kernel. In general the deeper the shade of green, the more the nuts are esteemed. Pistachio nuts are rich in oil, with an average content of about 55%. The trees begin bearing in 5 to 8 years, but full bearing is not attained until the 15th or 20th year. Pistachios tend toward biennial bearing, producing heavy crop one year followed by little or none the next. Production of nuts is also influenced by drought, excessive rain, heat or cold and high winds.
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