The vines of Poggio Maestrino are grafted into a ground which is rather rocky. Indeed, the precise technical definition is «siliceous clayey soils, rather gravelly, shallow and arid». They are soils with very low chalk content which must be ploughed and cleared from stones to make them suitable for vine planting. Of sandy-clayey consistency, they are rather arid and infertile which is a characteristic highly suited to vine cultivation.
