 flower teas, may last only a month or so. Others, such as pu-erh, improve with age. To remain fresh and prevent mold, tea needs to be stored away from heat, light, air, and moisture. Tea must be kept at room temperature in an air-tight container. Black tea in a bag within a sealed opaque canister may keep for two years. Green tea deteriorates more rapidly, usually in less than a year. Tightly rolled gunpowder tea leaves keep longer than the more open-leafed Chun Mee tea.Storage life for all teas can be extended by using desiccant or oxygen-absorbing packets, vacuum sealing, or refrigeration in air-tight containers (except green tea, where discrete use of refrigeration or freezing is recommended and temperature variation kept to a minimum).[79]Tea production – 2020CountryMillion tonnes China2.97 ඉන්දියාව1.2 කෙන්යාව0.43 ශ්‍රී ලංකාව0.34 වියට්නාමය0.214 තුර්කිය0.212සැකිල්ල:IRN0.16 ඉන්දුනීසියාව0.14 ආර්ජන්ටිනාව0.10 ජපානය0.08Source: Worldatl