An overview of the types of pistachios grown in the United States

About 97% of the pistachios cultivated in Iranian Pistachio the United States are from a female cultivar called Kerman and a male cultivar called Peters. Kerman pistachio cultivar was taken to Califoia by seeds from Rafsanjan in 1929, and after several years, this cultivar was widely cultivated in the United States. Characteristics of Kerman cultivar: medium growth strength, direct growth, flower production in late March and early April, uniform maturation on the tree, late (fruit production from September to mid-October) and high cooling requirements. The growth rate of Kerman cultivar and P. integerrima rootstock is similar. Characteristics of Kerman pistachio fruit: round fruit, crisp and suitable keel, pink and greenish yellow. High percentage of laughter and of course in some years has a high percentage of emptiness. The pistachio cultivar Kermanarqam Peters was introduced by Mr. Peters, which probably originated in Armenia. This cultivar produces suitable pollen grains and with about 3 weeks of flowering period, it has a good overlap with Kerman female cultivar for pollination of this cultivar. Other male cultivars include "Kaz", "Ell", "Chico" and "Randy", which may have originated in Azerbaijan.