Why it matters
The producer
Kevin Judd spent 25 vintages building Cloudy Bay from a new venture into the wine that made Marlborough Sauvignon Blanc a category. When he left in 2009 to start Greywacke, he made a deliberate set of choices that ran counter to everything a successful commercial career would suggest: no owned winery, minimal land, fruit from a single trusted family, and wild yeast from tank to barrel. The scale dropped. The specificity went up.
Greywacke operates from the Omaka Valley outside Blenheim, leasing its production facilities and drawing roughly 75% of its fruit from the Sutherland family vineyards in central Marlborough. Seven wines form the range. Judd describes the project as a celebration of place, driven by varietal and seasonal expression rather than house consistency. That is the exact inverse of what large-scale commercial winemaking demands, and the wines taste like someone meant it.
Place and vineyards
Where the wines begin
Marlborough sits at the northeastern tip of New Zealand's South Island, where the Wairau River has deposited a broad alluvial plain between mountain ranges. The Wairau Plains form the flat, free-draining floor of the region: stony soils, long sunshine hours, and cool nights that slow ripening and hold acidity in the grapes. The Southern Valleys run inland from the plains, cutting between the Wither Hills, where the soils are heavier and the aspect shifts. Fruit from the valleys adds weight and aromatic concentration to whatever is grown there.
The Sutherland family vineyards, which supply the majority of Greywacke's fruit, sit on the stony, free-draining soils characteristic of central Marlborough. Greywacke's sourcing strategy prioritises low-yielding sites within these two zones rather than seeking specific geological markers. Lower yields concentrate sugars and aromatic compounds in each grape, which matters most in varieties like Sauvignon Blanc and Chardonnay, where the difference between adequately ripe and properly ripe fruit shows clearly in the glass.
In the cellar
Vineyards and cellar
All fruit comes from low-yielding sites in the Wairau Plains and Southern Valleys. Judd contracts from the Sutherland family for roughly 75% of what Greywacke needs, selecting parcels for yield restriction and site character rather than volume.
Wild yeast fermentation is used across the range. Spontaneous fermentation takes longer than inoculated fermentation and carries more risk of stuck or uneven conversion, but it introduces complexity that cultured yeasts do not. In the Sauvignon Blanc, wild fermentation adds a savoury, textured dimension to the aromatic fruit. In the Chardonnay, it is the governing decision: 100% wild yeast, with 20% of the fruit fermented in heavily toasted French barrels and aged on lees for 18 months. The toasted oak integrates into the fruit rather than floating above it. The remaining 80% avoids new wood, so the barrel fraction works as seasoning rather than signature.
Wines to know
The range in view
The range opens with two Sauvignon Blanc expressions. The standard Greywacke Sauvignon Blanc is intense and aromatic: capsicum, guava, gooseberry, mineral freshness, and citrus, drawn from Wairau Plains and Southern Valleys fruit. It is the commercial anchor and the bottle most people reach for first. Wild Sauvignon uses wild yeast throughout, which slows fermentation and builds apricot, lime, and herbal notes alongside a firmer acid line and more weight on the mid-palate. The two bottles represent the same grape and the same sourcing zone read through different fermentation decisions.
Chardonnay is where the cellar argument becomes clearest. Wild yeast fermentation, 20% in heavily toasted French barrels for 18 months on lees, and 80% in neutral vessel: the result carries lemon curd, white peach, and oyster shell, with nutty yeast texture from the extended lees contact. The oak fraction adds weight and a biscuity richness without tipping the wine toward a toasty style.
A useful way in
A bottle to begin with
Start with the Greywacke Chardonnay. It is a 100% wild-fermented Chardonnay from low-yielding Marlborough sites, aged 18 months with 20% in heavily toasted French barrels and 80% in neutral vessel. The glass gives lemon curd, white peach, oyster shell, and a nutty richness from the lees. The oak sits inside the wine rather than on top of it. No residual sweetness, no obvious barrel flavour, but real weight and length. It is the bottle that shows most clearly what Judd chose to do after Cloudy Bay: a Chardonnay made by hand, from contracted fruit, in a leased winery, with no shortcuts in the cellar.