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.
Whether you can see it or not, you are adding more moisture to the leaf by keeping it in the refrigerator than at room temperature. A good rule of thumb may be that long-term refrigerated storage of a sealed container is a great idea, but daily storage of a tea you access regularly is discouraged.hether you can see it or not, you are adding more moisture to the leaf by keeping it in the refrigerator than at room temperature. A good rule of thumb may be that long-term refrigerated storage of a sealed container is a great idea, but daily storage of a tea you access regularly is discouraged.