Since the vineyards are planted in relatively acid and clay-rich soil of fluvial and alluvial origin, they benefit from good drainage since they lie on the slopes of the hill. The vines are tended exclusively by hand, and at harvest time, the grapes are also picked by hand. The technique of thinning out the grapes before they are mature, leaving only one bunch on every vine-branch, increases the cost of the grapes dramatically but it is fundamental to the quality, since it helps to concentrate the flavours and the perfume. The perfumes are also enhanced by the unusual climatic conditions. There is a considerable drop in temperature at night compared to daytime, due to cool air flowing down from the Alps nearby. The result is an elegant, complex wine, recognised over the years for its complexity, excellence, structure and aromas. A very impressive wine at its best after a suitable period of ageing.