After fertilization at the blossom the berries begin to grow very quickly. The acid concentration in the unripe berries rises to a maximum, then the acid concentration is reduced and the sugar content increases rapidly. At this time, the starts within the annual growth cycle the vine as veraison designated maturity phase, when the berries soften and begin to discolour. The completion of the maturity phase or peak of the maturation is due to an optimal ratio of sugar to acid marked (see also under physiological maturity ). The duration between flowering and maturity is ever vine very different, therefore one speaks accordingly from early to late maturing grape varieties. Influence on it too soil type. climate. Weather and the work of winegrower, The ripening time is also dependent on the microclimate in the vineyard and can also be individual Clone of the same grape variety. Even in smaller winegrowing areas, the same grape variety can deliver different results.