The temperature at which you steep tea matters - delicate leaves steeped at too high of a temperature will burn and leave a bitter flavor in the cup. Each two leaves tea company™ tea has recommended steep temperatures, but there are a few hard and fast rules you can follow to determine what steep temperature to use:
Below Boiling Water Temperature
White and green teas have delicate leaves, and therefore require below boiling water temperatures between 170 and 185 degrees Fahrenheit. Too high of a temperature will cook the leaves and ruin their delicate flavors.
Medium Boil Temperature
Oolong teas should be brewed at temperatures between 180 and 190 degrees Fahrenheit.