He is the Godfather of  Sicilian wine. At I Vigneri production is split between the white Carricante on Etna's Mediterranean-influenced south-east facing vineyards, and its very old vine Nerello Mascalese in the high altitude northern side of the volcano. 
There is nothing used in the vineyards except copper/sulfur mix. No fertilizers, herbicides or pesticides are used. 
The grapes are harvested by hand at the end of September until mid-october. Fermentations are done in open oak vats, without enzymes or thermal control (the nights by this time of year are quite cold). Racking and bottling are done under lunar cycle. The result is an exquisite balance and drinkability.