The plants are droecious, with separate male and female trees. The flowers are apetalous and unisexual and borne in panicles. These plants can survive temperature ranges between −10°C (14 in winter to 40°C in summer. They need a sunny position and well-drained soil.
Pistachio Tree

Pistachio fruit is a drupe, it contains elongated seed, which is edible thing. The seed commonly known as nut. The seed has a mauvish skin and light green flesh, with a distinctive flavor.
Pistachio nuts in and out of the shell

The pistachio shell is a beige color, it is dyed red and green in color. Roasted pistachio nuts can be artificially turned red if they are marinated prior to roasting in a salt and strawberry marinade, or salt and citrus salts.
It demonstrated over a 10% reduction in LDL (bad) cholesterol in those who consumed up to 126 grams of salted pistachio nuts a day, which was about 20% of their total energy intake. It remains to be seen if trials in which the participants eat pistachios but control their own diets, result in reductions in heart disease or stroke.
Latest study reveals that pistachio nuts are bring down levels of bad cholesterol in the blood. But Nutritionists warn that eating too many pistachios may lead to excess weight, which is not good for the heart.