Pomegranate is mainly distributed in subtropical and temperate regions, and now it is distributed in Asia, Africa, Europe, America and other places, almost all over the world. Pomegranate is cultivated in China, Iran, Afghanistan, Azerbaijan, Georgia, India, Turkmenistan, Uzbekistan, North Korea, South Korea, Indonesia, Japan, Lebanon, Syria, Egypt, Tunisia, Libya, Israel, Turkey, Spain, France, Britain, the United States, Mexico and other countries. It is also cultivated in China and India in Asia, Mediterranean countries in Europe and many countries in Africa, but it is still widely distributed in Iran and its vicinity. Among them, Iran has the largest planting area and is Iran's main export fruit. According to Iranian official reports, by the end of 2002, Iran's pomegranate planting area was 57,000 hectares, with an annual output of 555,000 tons, which was exported to Europe18500 tons and earned foreign exchange of 436,000 US dollars. And many excellent varieties have been bred, the main cultivated variety is "Malasi", with more than 500 grams of fruit, thick red skin, pink and bright red seeds and sweet and sour taste. It began to mature in September, and the harvest was the highest in June at 5438+ 10. At present, there are more than 240 varieties of pomegranate germplasm resources in China, more than 180 varieties in tehran province Varamin Research Center, more than 300 varieties in American National Pomegranate Germplasm Resources Park and more than 60 varieties in Japan.