White tea is grown in China and harvested between March and early April. It is found under the names Aiguilles d'argent, Bai Hao Yin Zen, Bai Mu Dan or even Yin Zen. To harvest it, you have to pick by hand the downy buds of the tea plant coming from a cultivar nicknamed Da Bai (or Dai Bai which means “big white” in Chinese).
