Blueberries begin their life as a little, green berry. What happens to transform them into a plump, blue pockets of flavor?
Fertilization of the ovary
Flower swells rapidly for about a month and then stops.
Green berry develops with no change in size.
Calyx end turns purplish and rest of berry becomes translucent in appearance.
Next few days a light purple color begins to develop and then deeper purple.
During color change the berry volume increases rapidly.
Intensity of pigmentation increases during the first six days of color change. Therefore most of the anthocyanin. is developed in the fruit during this early stage of maturation.