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What Are Pistachios? Pistachio is a dry fruit from the pistachio tree; a small tree with origins in the Middle East and Central Asia. The pistachio tree belongs to the cashew family. Their fruit is a drupe that contains an elongated seed; it is this seed that people eat. The seed is a culinary nut, rather than a botanical nut, and has a distinct flavour.
The pistachio is a small tree, reaching about 30 feet of height at full maturity. Usual commercial plantings are approximately 120 trees per acre. They begin to produce nuts in the 4th or 5th year after planting, and good production takes 8 to 10 years, with full bearing maturity occurring after 15 to 20 years.t is a deciduous tree, requiring approximately 1,000 hours of temperature at or below 45Â° F. in order to grow normally after its winter dormancy. Pistachio nut trees, generally, are suited for areas where summers are long, hot and dry, and the winters are moderately cold.