The minimum temperature required for grape growth is about 12℃-15℃, the lowest ground temperature is about 10℃-13℃, the optimum temperature for flowering period is about 20℃, and the optimum temperature for fruit expansion period is 20℃-30℃. If the temperature difference between day and night is large, the coloring and sugar content are better. After the grapes sprout in spring. If the temperature rises quickly, it will easily cause the branches to grow longer, which is manifested as the length of the knots is not full, and the flowering period is prone to poor fertilization.
