Height 30-50 cm. Sweetheart blueberry, also known as "Shuangfeng blueberry", is a low-bush blueberry with short trees, 30-50 cm high. It is cold-resistant and can be cultivated in low-temperature areas of -40°C. It is an early-maturing species and the fruits are concentrated during the ripening period. The fruits have a rich mango aroma after maturity. The fruits are extremely sweet and have a pleasant sour taste. They have excellent taste and are the best tasting among blueberry varieties. one.