Yiwu mountains are one of the most famous ancient tea forests, located in Mengla, Xishuangbanna, Yunnan, China. Since the old times, Yiwu has been considered one of the famous "Six pu'er tea mountains," and has the "Imperial tea" status. The teas from these places are famous for their sweet, deep, and complex flavours. Yiwu tea has a very unique character loved by many pu'er tea enthusiasts. The total area of the ancient tea forest is about 980 ha. The oldest and largest trees are about 10.5 m height and about 700 years old. The ecological environment is balanced, the energy of tea is pure, the tea gardens are surrounded by dense forest. The climate is humid and hot. Natural conditions like light, temperature, water resources, acidity and richness of soil are ideal for growing tea. Everything contributes to the growth of tea, the early appearance of buds full of strength and energy. Local tea leaves densely covered with fluff. According to studies, polyphenols, tea catechins and other useful substances are found in local tea is much more than in other similar tea regions. Annual production of tea made from ancient tea tree is about 100 tons.
Mao Cha translates as a "rough tea" and means that this tea is unfinished and is in an intermediate stage of production. This term is used for a tea material which is ready to be steamed and pressed in case of Sheng Pu'Er production. This type of tea is used for blending and further storage before being pressed into 'cakes'.