I've been trying to get into teas with more fruity flavors (pieces of fruit in the tea or tea based on fruit pieces) and I've noticed that a large majority of them have unpleasantly sour notes. Am I brewing incorrectly or is something else supposed to be added into the tea?  EDIT: It's teas that already have fruit pieces in them, and doesn't appear to be a particular fruit of any sort. I just steep tea leaves in a glass for a few minutes, usually with near-boiling water, then drink.  
Hibiscus is frequently put into herbal fruit teas, as it gives a rich red colour. It is also quite sour! If you dislike that flavour, you'd best avoid it. 