The grapes to produce the Sauvignon Blanc Marlborough Greywacke are harvested largely by machine during cool (often cold) night-time conditions, the grapes were trucked to the Greywacke winery in the Omaka Valley, where they were lightly pressed to yield a modest volume of high-quality juice. The juice was then cold-settled and racked prior to fermentation, primarily using cultured yeast in stainless steel for cool, slow fermentation. A portion of the juice was allowed to undergo spontaneous indigenous yeast fermentation in old oak barrels. All vineyard batches were left on lees and kept separate until late July, when the blend was assembled. The wine was bottled in mid-August 2020.
Fruit was sourced from prime vineyards in Marlborough’s Southern Valleys and the central Wairau Plains (specifically Woodbourne, Renwick and Rapaura). Soil types vary from the young alluvial soils of Rapaura and Renwick, which contain high proportions of New Zealand’s ubiquitous greywacke river stones, to the older and denser clay-loams of the Southern Valleys. Most of the vineyards were trained using the divided Scott Henry canopy management system, with the balance on a two- or three-cane vertical shoot positioning trellis.
Greywacke was created in 2009 by Kevin Judd, chief winemaker at Cloudy Bay from its inception for 25 years and instrumental in the international recognition which Marlborough Sauvignon Blanc enjoys now. The name ‘Greywacke’ was adopted by Kevin for his first Marlborough vineyard located in Rapaura in recognition of the high prevalence of rounded greywacke river stones in the soils of the vineyard, a sedimentary rock which is widely found in Marlborough. Kevin Judd is also New Zealand’s finest wine photographer and has recently published a book ‘The Landscape of New Zealand Wine’.