Caffeine content: Pu-erh tea has a lower caffeine content compared to other types of tea, making it a good option for those who are sensitive to caffeine. Aging: Pu-erh tea can be aged for several years to develop its flavor, and aged Pu-erh teas are highly sought after by tea collectors. Aroma and flavor: Pu-erh tea has a distinct, strong, and earthy flavor, and a pungent aroma that some describe as "musty" or "mushroomy.". Fermentation: Pu-erh tea undergoes a unique fermentation process that contributes to its rich, earthy flavor.