In this seventh video of our series ‘A year in the vineyards’ we look at the maturation studies carried out in the vineyards of Quinta dos Malvedos, which will guide us in determining the vintage starting date.
Maturation studies, which normally begin around mid-August, are of great importance in setting the vintage starting date and in preparing an optimum picking sequence, this being determined by the different maturation rates of each grape variety, as well as other influencing factors such as the vineyards’ location, altitude and climate. Carefully devised picking schedules ensure that the grapes are picked at their optimal point of ripeness.
Whilst nowadays, several advanced techniques are employed to assess berry ripeness, these do not replace frequent field sampling by our viticulturists and winemakers. In the vineyards they sample the berries for feel, taste and colour. As grapes ripen they become softer to the touch and taste sweeter, revealing the desirable accumulation of sugar as the grapes’ organic acids gradually diminish through the ripening period. They will also check for colour by squeezing berries in the palm of their hands to reveal the pigments on the skins and the appearance of the juice. The seeds or pips will also be checked for colour, as this is another reliable gauge of fruit ripeness; yellowish-green means unripe, whilst dark brown means ripening is on track.
To get the full picture of balanced fruit maturations it is important to also screen phenolic ripeness. The phenolic compounds, which include tannins and anthocyanins — the pigments responsible for colour — are a prerequisite for balanced and well structured wines with fresh aromatics. This year, when our maturation studies began on August 15th, it became apparent that phenolic ripeness was evolving very well whilst sugar readings were lagging behind. However, these have since caught up and we are looking at evenly balanced fruit maturation — a good augury for the forthcoming grape harvest.