The time it takes for the vine to develop and for the grapes to ripen depends on where on the territory the vine is located, the distance from the sea and on the trends of climatic variations. The wine-grower (vignaiolo) can decide to remove foliage near the grapes to favour the ripening of the grapes. The risk in the case of hail is that grapes can be even more ruined than they would otherway be, in the case he does not defoliate, the risk is that the grapes might not reach full ripeness.
