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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.
Site Selection for Growing Pistachio Trees. Deep, sandy loam soils are best for pistachios, but they will do well in most desert soils. The poorer the soil, the closer the trees are planted together. Pistachios are tap root trees, so they need deep soil (7 or more feet).They grow to 20-30 feet in height and about that in width in most cases.eep, sandy loam soils are best for pistachios, but they will do well in most desert soils. The poorer the soil, the closer the trees are planted together. Pistachios are tap root trees, so they need deep soil (7 or more feet).