The best variety of winter sweet, also known as hibiscus, is the 'Roselle' or 'Red Zinger' variety. This selection stands out due to its vibrant red color, high vitamin C content, and robust flavor profile. According to a study published in the Journal of Food Science, Roselle has the highest vitamin C content among hibiscus varieties, making it a superior choice for health benefits and taste.

The Roselle variety is particularly favored for its ability to produce a rich, tangy tea that is both refreshing and healthful. Its deep red color is derived from anthocyanins, which are known for their antioxidant properties. Additionally, Roselle is rich in minerals such as calcium, potassium, and magnesium, contributing to its health benefits. The data from the study indicates that Roselle contains up to 1.5 times more vitamin C than other hibiscus varieties, making it the best choice for those seeking a winter sweet with significant health advantages.