The grapes for the wines come from a range of selected vineyards in McLaren Vale and Adelaide Hills, including some over 80 years old. Winemaker Mike Farmilo joined the team as head winemaker and is assisted by Kate Day, who has been with Willunga 100 since its inception. Together they aim to produce unique and distinctive wines which capture the essence of the region. They use modern equipment alongside traditional winemaking techniques to ferment the small parcels of fruit arriving at the winery. The term "hundred" originates from late Saxon and Norman England and refers to an administrative unit of government, meaning that 100+ households had to live in the area to qualify for its place on the map. Willunga 100 select their fruit from small parcels just as the district was divided up into '100s', or small lots.