The crucial point in the annual Vegetation cycle of Vine . The grapes ripening (Fr. maturitÃ© = pleine maturity, maturitÃ© = fully ripe, overripe surmaturitÃ© =) is reached when acid and sugar content to be in harmonic relationship. The period between Bloom and full maturity, in addition to climate and Weather also from Maturity date (Early to late maturing) of the Grape -dependent. The green berries have a relatively high content of Acids , which are degraded during maturation, while the content of Sugar increases. In most wine regions of the northern hemisphere this is in September, in warm climates already reached in August. What is meant by full maturity is different in each country. In cooler areas they are mainly based on sugar content and the weight must .
The correct date for the Vintage is reached, when broken down in the grapes at night than during the day more sugar from the leaves is recycled. At this point, it does so no advantage to let the grapes hang longer. In warmer regions it takes special care that not too much acid is diminished. In recent years concerning the new term is physiological maturity emerged. The sugar content in the berries may by by measuring refractometer to determine. It is calculated by various methods and by the weight must be expressed in different metrics. Some of the new term Engustment (Formation of aromatic substances) used to describe a special stage at the end of the maturity phase. The next step is the development Leaf fall . See also Premature ripening .