All tea must be stored this way to preserve aroma and flavor. Whether you're a fan of tea bags or leaves is irrelevant. If you don't start with a good product, your end result will be the same. If water is boiled more than once, it reduces the amount of oxygen. This will give your tea less flavor and aroma.
Some leaves require water to boil and brew for specific amounts of time.
Following standard guidelines on tea packaging is essential to gaining maximum flavor and aroma. White sugar, sugar cane and sugar sticks are popular sweeteners for black teas. MILK or cream can be used with black teas, as can lemon wedgies. The standard measurement is usually 1 teaspoon of leaves per cup of water. Believe it or not, there's an art to making the perfect pot of tea.