GREEN TEA Tea is native to China, where cultivation began about 4000 years ago, but it wasn't until the 17th century that the British introduced and spread its use by implementing new growing areas such as India. Green tea is produced from leaves that are steamed and dried but not fermented. Such leaves produce a kind of greenish tea with a slightly bitter flavor. Scientific studies have shown that green tea increases the body's antioxidant activity. 25 bags.