What does 'véraison' signify in grape growing?

Véraison is a critical phenological stage in grape growing that marks the transition from berry development to ripening. This phase indicates the onset of sugar accumulation within the berries, which is essential for the production of wine, as it directly impacts the sweetness and overall flavor profile of the resulting wine. During véraison, grapes also begin to change in color, which is especially evident in red varietals, and this transformation correlates with the development of desirable flavors and aromas in the fruit. Understanding this stage is vital for winemakers, as it allows them to anticipate when to harvest the grapes to achieve optimal balance between acidity, sugar levels, and flavor characteristics.