Ra Nui believe that the wine is in the grape, focus is primarily on the vineyard, everything that comes after is meant to capture and preserve quality of fruit. Grapes are grown to the time honoured traditions of healthy soils, ample sun and good old fashioned love of the job. Much of the harvest is picked by hand, to be treated to a combination of new and old world vinification techniques, the ultimate aim being being to achieve a Sauvignon Blanc as articulate as a cornucopia of freshly cut fruit, decidedly Marlborough in a glass.

Sauvignon Blanc is sourced from three Wairau sites. Cob Cottage is at the southeast corner of the valley, on the road just south of Blenheim. Summer Valley vineyard lies 800 metres to the south of Cob Cottage and is a particularly warm microclime. Roughan Lee is a small block that lies between the township of Renwick, in the heart of the valley, and the banks of Omaka River. Fruit is immediately transported to the winery, passed through a receival bin and straight into the press. Juices are cold settled over forty eight hours and racked away from gross lees before inoculation to an aromatic strain of yeast. A long cool ferment follows, a portion in French oak barriques for several months on fine lees.