Tomato Blueberry is a very special tomato variety. The dye anthocyanin is responsible for the violet-blue color, while increasing the antioxidant content and thus making the tomatoes particularly healthy. The medium-sized round fruits are violet-blue from the start if they get enough sunlight to produce the blue color. Wherever the bracts partially cover the fruit or on the underside, where less sunlight reaches the fruit, they ripen from green to red.