It is easy to understand that the development of a grapevine and of a bunch of grapes depend, aside from their own peculiar qualities, on two major influences. That of man and of his work, which expresses his mastery of techniques and his (very relative) understanding of nature; and that of the weather, of the whims of air and sky, in step with the seasons.
Man does not yet master them. It seems that he is now dreaming of literally being able to make rain and shine. Allow us to remain skeptical in the face of the wild hopes of such sorcerer’s apprentices. Of course, each wine grower dreams of an ideal world in which each cycle of showers and sun would unfold in response to the needs of the grapes growing on his rows of vines. Since, logically speaking, an ideal remains an ideal, the work of man is there to correct any detrimental influences and to optimise those that will produce the hoped-for grapes once harvest time has come. No year is quite like another. And each climate, each soil has its specific requirements. It is still possible, however, to describe broadly the main stages that mark the maturing of grapes in step with the seasons.
Sources: wikipedia, Dictionnaire Larousse du vin, L’univers du vin. Gardeners wishing to grow a few grapevines can also consult the Gerbaud.com website, which provides a wealth of useful indications.
Around the month of June, the first berries born of fertilized flowers appear on the grapevine. The others wither and die. In a few words, « L’univers du Vin » describes the appearance of the grapes, « initially tiny, green and hard, (which) grow very quickly ».
This is the time when maximum and constant care is needed, for several diseases, such as fungi or parasites, threaten production. Too much humidity favors them. Human intervention can check them, but any responsible winegrower will naturally limit the use of chemicals to what is strictly necessary. As soon as the first grapes have appeared, the attention lavished on them irremediably signs the know-how and method proper to each winegrower.
We have already spoken here of leaf stripping, which consists in giving the grapes better exposure by removing the leaves that hide them from the sun. When the clusters are too dense, each grape does not fully benefit from the gifts of soil and weather. This calls for « vintaging green », also known as « thinning », that is, removing supernumerary grapes. This will of course reduce the final yield, but all quality has a price, and this is one of the elements that explain it.
(to be continued)
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