A tablespoon is a non-scientific but very widely used unit of volume, which works very well in cooking, herbal medicine, etc. It is represented by a capacity of one tablespoon which varies from roughly 15 mL in the US to 20 mL in Australia.
1 If tea is properly stored, it can potentially last up to a year for green and black teas. White tea lasts about six months before it isn't as good in quality as when fresher. Stale tea (or bad tea) will taste flat, as if you're drinking paper.  Glass or ceramic containers are fine provided that they're opaque.
Almost all food eventually goes bad, so it seems reasonable to think that tea (especially loose leaf tea) will also spoil. Especially if it has been stored in the pantry for the last 2 or 3 years. Fortunately enough, if the tea is stored properly it wonât go bad. It can, however, lose its taste, and thatâs the issue you should worry about. To retain the flavor you need to know how to store tea properly.