Hu County, Xi'an, Shaanxi. Pepper tree is a common plant whose peppercorn fruits have a special aroma and pungent flavor, and are widely used in cooking and traditional Chinese medicine. Tuxian is a county in Xi'an, Shaanxi Province, and is famous for the peppercorns it produces. Thornless Big Red Robe Pepper is a variety of pepper from Hu County, featuring full fruits, bright color and strong aroma. Thornless pepper seedlings are temperature-loving species, not cold hardy, the average annual temperature in the area of 8 ~ 16 ℃ can be cultivated growth, but the average annual temperature in the area of 10 ~ 15 ℃ is the most suitable for cultivation.