The Camellia sinesis Plant and Tea Processing
Wednesday, October 24th, 2007All true teas come from the same plant, Camellia sinesis. True teas include white, green, oolong, black and puer teas. Herb teas or tisanes include mint, chamomile, roobios and mate. These tisanes are from other plant species and have flavour and health properties all their own. When we speak of tea we are speaking of the variety from the camellia plant. The Camellia sinesis plant originated in China near the base of the Himalayas. India also has a Camellia sinesis native to their base of the Himalayas. There are thousands of varieties of Camellia sinesis plants, which like grape varietals affect, the final outcomes of the tea. The Camellia sinesis plant needs a subtropical climate with ample rain, acidic soil and sandy, well-drained locations. The traditions of tea cultivation come from china, which discovered that along with tea varietals, soil and climate, processing especially the degree of oxidation affects the flavour the final product. Oxidation is the process in with the tea leaves are exposed to air and the leaves start to turn dark. This is much like when and apple is cut and left out and the inside turns brown. The difference between a green, oolong and black tea lies mostly in this process.
Green teas have flavours closest to the Camellia sinesis plant itself. Green teas are simply picked, sweated, then cooked and dried, with the best ones being produced from early spring leaves. The variety of plant, picking time, picking method, cooking techniques and drying processes create the myriad of varieties we have available in China. Common Chinese green teas are, the famous Longjing (dragons well) from Zhejiang, Biluochen (spring snail) from Jiangsu, Maofeng from Anhui, and Maojian from Henan. Japan also has green tea traditions producing varieties such as Sencha, a powdered green tea called matcha, Bancha which is a lower grade Japanese tea including stems, and Genmaicha which is green tea mixed with toasted rice. Green teas have the shortest shelf life of all teas and are best drunk with in the first few months of picking.
White Teas, popular abroad, originated in Fujian China. These teas, made from only one variety of the tea plant grown in Fuding county, are first oxidized then roasted over coals until dry. These teas are light and sweet and have wide appeal. Often tea drinkers who are turned off by the grassiness of green teas enjoy white teas.
Oolong teas, spelled wulong in Mainland China, are partially oxidized teas and typically come from Fujian, Guangdong, and Taiwan. The tea variety used the, the amount of oxidation and the rolling techniques all affect the end flavour. Rock oolongs from Wuyishan called yancha are highly oxidized 70-80%, dried then toasted. Wuyishan is known to have thousands of different tea varietals. These Wuyi teas are robust with mineral characteristics. Common varieties are Dahongpao, Shuishen, and Rougui. Anxi, a county in the south of Fujian is famous for producing Tieguanyin (iron goddess of mercy). These teas are lightly oxidized, 15-20% then bruised and tightly rolled. They are fragrant, floral fruity teas often with orchid or peach characteristics. Oolong tea with its wide range in flavours, hugely popular in Asia, is often the forgotten category in the western countries.
Black teas, known in China as hongcha (red tea) are fully oxidized and drunk less commonly in China. Common Chinese black teas are Qimen (keemun), Zhenshanxiaozhong (Lapsong souchong) and Dianhong (Yunnan imperial). Chinese black teas are robust and often malty. Black teas can be held for a year or two with out going stale, which made them popular for export in the times when tea was slowly exported by sea.
Puer teas, categorized in China as heicha (black tea) go through various enzyme processes. All puer tea is picked, cooked to reduce moisture and then sun dried. This sun drying produces a base material called Saiqingmaocha, which is then further processed into shou or sheng puer. Saiqingmaocha is often made near where the tea is picked and then a buyer who owns puer facilities buys this raw material to produce into their end product. Sheng puer is steamed and pressed into cakes or bricks of tea and then baked to remove any final moisture. Shou puer goes through a wodui processing, which was invented by the Menghai puer factory in the 1960’s to mimic the flavour of aged sheng puer teas. This process was held a state secret for many years and creates robust earthy teas with ruby infusions. Puer teas come loose and in bricks or cakes and can be stored for many years.