The main growing area historically is Iran, but the pistachio was brought to the US by Iranian people and widely cultivated. Besides these two main areas the product can also be found in Turkey and South Africa.All origins harvest takes place around September.Iranian Pistachios:Round Pistachio (Fandoghi) Available in sizes 26-28, 28-30, 30-32Long Pistachio (Akbari) Available in sizes 20-22, 22-24Long Pistachio (Ahmad aghaee) Available in sizes 22-24, 24-26Long Pistachio (Badami) Available in sizes 24-26, 26-28, 28-30Jumbo Pistachio (Kale ghuchi) Available in sizes 18-20, 20-22, 22-24, 24-26Natural Pistachio kernel (red and cream colour)Green kernel PistachioRoasted and Salted PistachioRoasted and Unsalted PistachioUS PistachiosU.S. Fancy, U.S. No. 1, U.S. No. 2 and U.S. No. 3;Extra Large: 20 or less nuts per ounce;Large: 21 to 25;Medium: 26 to 30;Small: 31 or more.