Henan Yanling belongs to Xuchang City. According to the official website of the Yanling County People's Government, Yanling County is located in the east of Xuchang. As early as 8,000 years ago, the Xuyou tribe thrived here. After King Wu of Zhou destroyed the Shang Dynasty, he divided the world and called it "Yan Kingdom". During the Spring and Autumn Period and the Warring States Period, the princes competed in the Central Plains. Zheng Beike Duan Yu Yan, Jin Chu Yanling Battle, Famous historical events such as Tang Ju's fulfilling his mission took place here; the "prefecture and county system" of the Eastern Han Dynasty was established as "Yanling County", which has been used to this day. It has 27 cultural protection units at the national, provincial and municipal levels, including Xu You's Tomb, Yin Zhou Monument, Qianming Temple Pagoda and Xingguo Temple Pagoda. Yanling is a natural domestication base for "southern flowers migrating north and northern flowers migrating south". It has a provincial-level flower and tree industrial cluster, forming more than 2,400 varieties of green seedlings, bonsai potted flowers, and cut flowers. The flower and tree coverage rate is 32% and the forest coverage rate is 32%. With a rate of 7.5, it was named the “Hometown of Flowers and Trees in China”. The content of negative oxygen ions in the air in the main flower and tree production area exceeds the clean air standard defined by the WHO by nearly 10 times, and it is known as the "natural oxygen bar" and "the lungs of the Central Plains". The groundwater in Chenhuadian Town is rich in various trace elements necessary for the human body. It has been included in the "National Geographical Indication Product Protection" together with "Yanling Wintersweet" and has been rated as the "Hometown of Longevity in China".