Green tea is produced mainly in China, Japan, Taiwan and Sri Lanka. These are teas that are non-oxidized. The leaves are picked, aired (in order to reduce their humidity), and then heated for a few minutes. They then undergo a mixing and drying process, which is repeated several times. Depending on the methods being used, each tea develops its own appearance and characteristics: it may be flat, twisted or rolled... but all green teas share the common characteristic of being highly perfumed.
Tea China - Gunpowder Org