In the life cycle of any tea, there comes a time when its flavour diminishes, so that it is no longer as pleasant to drink. This deterioration can be strongly influenced by the storage conditions. After the tea’s production is complete and it is considered ready for consumption, the biochemical changes in it continue. The extent of these changes varies depending on the type and quality of the tea’s raw materials. While some teas lose flavour, freshness and depth over time (green tea, some black teas, yellow tea, balled jade oolong), others can improve with ageing (dark and roasted oolongs, white tea, some black teas, pu’er).
Every tea seller indicates the best-before date on the tea packaging to guarantee the product’s quality. However, it is important to note that high-quality teas do not “expire” after the specified date, but start losing their optimal flavour. If you follow some basic guidelines, you can extend the shelf life of your tea.
Packaging
Tea should be stored in an airtight container, away from moisture, light, heat and strong odours. If your tea comes in resealable packaging, make sure to seal it tightly after each use to prevent air from getting in. If not, transfer the tea to an airtight container to protect it from moisture and air exposure. Oxygen leads to further oxidation, while moisture destroys it completely and causes the development of harmful molds. The packaging should not be transparent unless you store the tea in a dark room.
Temperature and Humidity
Tea should be stored in a cool and dry environment. High temperatures can cause the tea leaves to dry out, which impairs the flavour and freshness. Some producers recommend storing their teas in a freezer or refrigerator, where they develop even more complex tastes, amazing aromas, and extend their shelf life. In this case, the container should be as tight as possible. Tea is hygroscopic and absorbs moisture or smells easily. Avoid keeping tea near kitchen appliances or in areas with fluctuating temperatures, such as near ovens or windows.
