Seña: Aconcagua Valley's Pioneering Bordeaux Blend

Seña was born in 1995 from a bold collaboration between Eduardo Chadwick, whose family owns Viña Errázuriz founded by Don Maximiano Errázuriz in 1870, and the late Robert Mondavi of California. Mondavi had pioneered Opus One in Napa alongside Baron Philippe de Rothschild, and he encouraged Chadwick to pursue a classic Bordeaux-style blend that would demonstrate Chile's potential for world-class wine. After four years of searching the Aconcagua Valley, the team identified the Ocoa site and the first vintage was released in 1997. The early vintages were made by Tim Mondavi, with Ed Flaherty subsequently taking over, before Francisco Baettig assumed the role at Errázuriz in 2003 and has guided Seña ever since. When Constellation Brands acquired Robert Mondavi in 2004, Chadwick purchased the Mondavi share, and since 2005 Seña has been solely owned by the Chadwick family. The name means 'sign' or 'personal signature,' reflecting the founding families' intent to signal Chile's quality to the world.

• 1995 inaugural vintage; joint venture between Eduardo Chadwick and Robert Mondavi, released to critical acclaim in 1997
• Tim Mondavi made the first four vintages; Francisco Baettig has directed winemaking since joining Errázuriz in 2003
• 100% Chadwick family-owned since 2005; the 2004 Berlin Tasting, where Seña 2001 placed ahead of top Bordeaux châteaux, cemented its international reputation
• Viña Errázuriz was founded by Don Maximiano Errázuriz in 1870 in the Aconcagua Valley

The Seña estate covers 350 hectares in total, with 42 planted to vine, on the eastern side of the Ocoa coastal mountain range within the Aconcagua Valley, roughly 40km from the Pacific Ocean. The hillside vineyards rise to approximately 510m at their highest point, providing a slightly cooler mesoclimate than the valley floor, with harvest typically running about two weeks later than lower sites. The Pacific proximity delivers a consistent afternoon coastal breeze that moderates afternoon heat, while cold mountain air descends at night, creating meaningful diurnal temperature variation. Soils across the estate are gravelly and volcanic in character, providing good drainage and moderate vine vigor. Following detailed soil studies, Merlot was removed from the vineyard as a shallow-rooting variety unable to cope with the site's heat and dry conditions; it was replaced progressively with Malbec.

• 42 planted hectares on hillside slopes in the Ocoa zone, Aconcagua Valley; estate total is 350 hectares
• Vineyards rise to approximately 510m at the highest point; about 40km from the Pacific Ocean
• Afternoon coastal breezes and cold night air provide meaningful diurnal temperature variation
• Gravelly, volcanic soils; Merlot was removed after proving inconsistent and replaced with Malbec

Seña is modelled on a Bordeaux blend but carries a distinctly Chilean identity through the inclusion of Carmenère, and increasingly Malbec, alongside Cabernet Sauvignon. The blend is not fixed: Cabernet Sauvignon typically represents 50 to 60 percent, with Malbec, Carmenère, Petit Verdot, and Cabernet Franc making up the balance in proportions that shift depending on vintage conditions. In cooler years, when Carmenère can struggle to reach full physiological maturity at the Ocoa site, the proportion of Malbec is increased; in warmer years, Carmenère plays a larger role. Fermentation takes place primarily in stainless steel, with a small portion in oak vessels. The wine is then aged for 22 months in French oak barrique, with a portion in large Stockinger foudres, balancing complexity with freshness. Recent vintages have trended toward lower alcohol and greater elegance, reflecting Baettig's philosophy of freshness and precision.

• Cabernet Sauvignon-dominant (50–60%) with vintage-variable proportions of Malbec, Carmenère, Petit Verdot, and Cabernet Franc
• Carmenère inclusion gives a distinctly Chilean character; Malbec replaces Merlot, which was phased out
• 22 months aging in French oak barrique plus large Stockinger foudres; new oak proportion varies by vintage
• Recent vintages show a move toward lower alcohol, greater freshness, and refined tannin structure

Seña has farmed biodynamically since 2005, the year Chadwick took sole ownership of the project, and the grapes are certified organic and biodynamic. Biodynamic viticulture treats the estate as a self-sustaining ecosystem, incorporating compost preparations, cover cropping, and holistic soil management without synthetic pesticides or herbicides. Hand-harvesting preserves fruit integrity, and careful canopy management optimises sun exposure across the hillside blocks. The approach has evolved steadily: Francisco Baettig and his team have worked to coax greater freshness and precision from the site, adjusting yields, canopy architecture, and picking dates over successive vintages. Sustainability credentials align Seña with the broader movement among elite Chilean producers toward regenerative farming, reinforcing both quality and ethical provenance.

• Biodynamic farming since 2005; grapes certified organic and biodynamic
• Holistic estate management: cover crops, compost preparations, no synthetic pesticides
• Hand-harvesting and selective canopy management optimise fruit quality across hillside blocks
• Sustainability commitment aligns with the shift among premium Chilean producers toward regenerative viticulture

Young Seña typically shows dark cherry, blackcurrant, and redcurrant fruit with floral notes of violet and wild lavender, layered with garrigue, cedar, and cigar box. Carmenère and Cabernet Franc contribute herbal and spice notes, while Malbec adds aromatic lift and softer texture. On the palate, fine-grained, refined tannins provide structure without austerity, and the coastal influence of the Ocoa site delivers a freshness and balance unusual for a wine of this ripeness and body. With age, the wine develops graphite, tobacco leaf, and earthy complexity, with tannins resolving to a silky texture. Recent vintages have been noted for drinking well relatively early while still rewarding extended cellaring. Critics have suggested drinking windows extending to 2040 for top vintages such as 2021, with Francisco Baettig estimating a good 20 years of cellaring potential for well-structured releases.

• Young: dark cherry, redcurrant, violet, garrigue, cedar, and herbal notes from Carmenère and Cabernet Franc
• Palate: fine-grained tannins, good acidity, and coastal-influenced freshness; medium-to-full body
• With age: graphite, tobacco, earthy complexity; tannins resolve to silky texture
• Top vintages (such as 2021) carry drinking windows to 2040; Baettig estimates 20 years of cellaring potential

Seña's international reputation was transformed by the 2004 Berlin Tasting, an event conceived by Eduardo Chadwick that pitted Seña and its sister wine Viñedo Chadwick against top wines from Bordeaux, Napa Valley, and Tuscany in a blind format. The results shocked the wine world: Viñedo Chadwick placed first, and Seña came second, ahead of châteaux including Margaux, Latour, and Lafite Rothschild. The tasting was reprised multiple times with similar outcomes, rapidly elevating the profile of both wines and of Chilean fine wine more broadly. Today Seña sits at the top tier of Chilean collectibles alongside Almaviva, the Maipo Valley Bordeaux blend established in 1997 as a joint venture between Baron Philippe de Rothschild and Viña Concha y Toro, and Clos Apalta from Lapostolle. The wine holds Aconcagua Valley DO status and is widely credited as Chile's first true icon wine.

• 2004 Berlin Tasting: Seña 2001 placed second behind Viñedo Chadwick, ahead of Margaux, Latour, and Lafite Rothschild
• Eduardo Chadwick has reprised the tasting multiple times with consistently strong results for Seña
• Sits at the elite tier of Chilean fine wine alongside Almaviva (Rothschild-Concha y Toro, founded 1997) and Clos Apalta
• Widely credited as Chile's first icon wine; holds Aconcagua Valley Denominación de Origen