I don’t know…I can’t find much to complain about with these bagged herbal tisanes! I think they taste very pleasant and after a day of doing, doing, doing I like to throw the teabag in and some honey and forget about it! This blueberry one tastes very natural – almost like the blueberries in a muffin or pancake. I am not finding it tart at all. Just a little sweet treat before I get into bed to read Julia Child’s My Life in France (so hysterically funny!! So beautiful. A philosophy on not only how to cook but how to live).