Dim sum various mixtures of flowers with green tea, black tea or oolong tea. Flowers used include jasmine, gardenia, magnolia, grapefruit flower, sweet-scented osmanthus and rose. There are strict rules about the proportion of flowers to tea. Jasmine tea is the most popular type of scented tea, and is often the most popular type of tea served at yum cha establishments. The above teas are produced in most of China. Chinese tea bushes ("Camellia sinensis") are cultivated in the mountain areas of tropical and subtropical regions or wherever there is a proper climate, sufficient humidity, adequate sunshine and fertile soil. Chinese tea
Tea processing use in Chinese herbology, production methods changed, where the processed green tea leaves were not immediately dried after steaming. Rather the steamed tea leaves were first pulverized into a paste form, with the paste then formed in moulds and slowly dried into brick tea, a technique well described by Lu Yu in his work "The Classic of Tea". Tender leaves and leaf buds were generally not used, as older mature tea leaves were preferred for tea production. Some tea bricks were also produced from mature whole leaves, which typically required the use of a cooked rice slurry (米湯) to bind