Although tea is produced in more than 25 countries, the major producers include China,India, Indonesia, Kenya, Malawi, and Sri Lanka . Buddhist priests are thought to have been responsible for spreading the cultivation of tea throughout China and Japan. The three main categories of are black, green , and oolong. Within each of these categories there are many varieties. Black and green teas come from the same tea plant species, the difference being the processing procedure that each leaf undergoes .
Black tea undergo several hours of oxidation before drying.
Green tea is steamed immediately after picking to stop oxidation. Most popular is oil of Bergamot - a citrus tree native to Italy.