Why is Nanchong called "Fruit City"?

Guocheng is the abbreviation of Nanchong City, the second largest city in Sichuan Province, also known as the Fruit State. Ancestors lived in Nanchong in the Neolithic Age. Xia Dynasty was the Guo kingdom, Yin Shang was the Ba kingdom, and Zhou was the Ba kingdom. During the Warring States Period, around 330 AD, the capital of Bazi was moved to Langzhong, Qin Huiwen and Wang destroyed Bazi in the ninth year, and Langzhong County and (now Chongqing) County were established in the eleventh year. During the Warring States Period, Qin destroyed Shu and Ba successively, and set up Shu County and Ba County respectively, and Nanchong belonged to Ba County.