Volcanic soils, rich in potassium, phosphorus and other elements. Though quick draining, this type of soil retains sufficient moisture to sustain the vine even in times of drought. The high concentration of minerals in the soil favours the production of top quality fruit. The Colle Gaio vineyard is a 3 ha. slope facing North-East in the commune on Monte Porzio Catone at 400 m.asl. Locally recognized as one of the top crus of Frascati. Short pruning and radical summer bunch thinning concentrate yields to a mere 20 hl/ha.