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. 
The fruit for Greywacke Marlborough Riesling was grown at the organically-farmed Ashmore Vineyard in Fairhall, adjacent to the mouth of the Brancott Valley on gravelly clay-loam soils, conditions more typical of the Southern Valleys than the Wairau plains. The 17 year old vines were trained on a two cane VSP (vertical shoot positioning) trellis and careful shoot and bunch thinning was carried out. All Greywacke wines are produced from vineyards that are accredited to the Sustainable Winegrowing New Zealand (SWNZ) program and most of the vineyards are in conversion to become certified organic.
A highly fragrant style combining classic lemon/lim e fruitiness with delicate pastis notes and a lavender-like floral dimension. The wine's sensory profile is enhanced by the wild yeast, adding more savoury nuances of lanolin and gunflint. An off-dry style that delivers a sherbet-like balance of bright, natural acidity and a subliminal touch of sweetness.