Yichang has a long history of producing citrus. Qu Yuan's Ode to Oranges proves that citrus was planted in Yichang at least two thousand years ago. According to Records of Historical Records and Biography of Huo Zhi, there are thousands of trees and oranges in Jiangling, Shu Han. Due to its superior geographical and climatic environment, Yichang is the highest in Hubei Province, far from being a "country with thousands of trees". 199 1 output130,000 tons or more, with many excellent varieties.