Tandem's vineyard philosophy is based around sustainable farming and using minimal intervention, while maintaining the vineyard’s health and viability. The natural conditions of the valley ensure that pesticide treatments can be kept to a minimum and take the form of sulphur and copper, avoiding products made from synthetic chemicals. The vines are dry-farmed and undergo a green harvest, in order to obtain lower yields and a key factor in achieving a greater concentration in the berries. The vines are trained using the Guyot method and are grown in clay loam soils. Harvesting is carried out at the moment of optimal ripeness and takes place during the coolest hours of the day, so the grapes retain their freshness.
The grapes were harvested at night to retain freshness. After several hours of prefermentation maceration at 10°C, the must was racked. 100% of the Viognier was fermented in 300 litre French oak barrels while the Viura was fermented in stainless steel. Daily bâtonnage lasted for four months adding texture and complexity. Tandem's winery is built partially underground to create a gravity fed winery with minimal stress for the wines.