Greywacke is a winery in Marlborough, South Island, producing wines that have drawn assessment from Decanter, Wine Advocate, Wine Enthusiast, Wine Spectator, and Falstaff. The house specializes in Gewürztraminer and Sauvignon Blanc, with particular distinction in late-harvest and botrytis expressions. Its Botrytis Gewürztraminer and Gewürztraminer Late Harvest both average 93.0 in prestige ratings, capturing the aromatic intensity and honeyed complexity that botrytis-affected Gewürztraminer can achieve in cool climates. The Wild Sauvignon, crafted from Sauvignon Blanc, averages 91.9 and reflects Marlborough's reputation for vibrant, herbaceous expressions of the variety. These wines demonstrate the winery's focus on capturing regional character through both dry and sweet formats, positioning it within Marlborough's broader tradition of aromatic white wine production.