Blueberry , also known as Lanmei, Dusi, Dusi, Duxi, Dusi, Dianguo, Dusi bilberry. The blueberry fruit is light green at first, then turns to reddish purple, and finally becomes blue or deep purple, when it is ripe for harvest. Blueberries have a sweet flavor and different acidity. They are used in desserts such as jelly , jam , ice cream and pies . They are also baked in muffins and are one of the ingredients in many desserts and delicacies. The blueberry season runs from May to October each year, reaching its highest peak in July.