Knights Valley has long been defined by its Cabernet Sauvignon. The volcanic soils, mountain terrain, and varied microclimates that make it exceptional for bold reds also hold potential that Beringer's winemaking team has been exploring for years. The Alluvium Blanc is one of the results: a Bordeaux-style white wine built on the same block of land that has anchored Beringer's Knights Valley program since the mid-1960s.
At a Glance
- Wine: Alluvium Blanc
- Style: Bordeaux-style white wine, cold and reductive
- Origin: Knights Valley AVA, Sonoma County
- Key Technique: Stabulation — cold pre-fermentation aromatic development
- Winemaking: Split-block fermentation, stainless steel aging, no oak
- Explore: Knights Valley Collection
About Knights Valley
Beringer has owned and farmed its Knights Valley vineyards since the mid-1960s, when the Beringer family recognized that the cobbled alluvial soils were ideal for high-quality wine grapes. The Knights Valley designation first appeared on a Beringer label in 1974, and Beringer was instrumental in securing the region's own American Viticultural Area (AVA) designation in 1983.
Located 17 miles north of Beringer's Napa winery in Sonoma County, Knights Valley lies in the shadow of Mount St. Helena. The hilly terrain descends to rocky, alluvial soils formed by ancient rivers. The region has proved exceptional for Cabernet Sauvignon and Sauvignon Blanc, and its combination of terrain, microclimates, and soils continues to support new directions in viticulture that inform Beringer's wines across the portfolio.
The Name: Alluvium Blanc
Alluvium Blanc takes its name directly from the geology of the site. Knights Valley was formed through the action of rivers, which created alluvial fans as they swelled during winter and receded in summer. Those ancient waterways left behind the rocky, mineral-rich soils that give the wine its distinctive character. The name is not decorative — it is a description of the land the wine comes from.
The Winemaking: Stabulation and Split-Block Fermentation
The winemaking team's goal was specific: an aromatic, fresh, and precise white wine with a character that would stand apart from anything else in the Knights Valley lineup.
To achieve this, they used a technique called stabulation, a cold and reductive pre-fermentation process that concentrates the wine's aromatics before fermentation begins. After harvesting, the grapes are whole cluster pressed and kept cold. The juice is held at 30 to 32 degrees Fahrenheit and mixed daily for up to three weeks before fermentation starts. At this temperature, enzymatic activity is suppressed, preserving aromatic compounds that would otherwise be lost. Fermentation then runs low and slow at 50 degrees Fahrenheit, often taking several weeks to complete. The wine is racked clean off its lees and stored in stainless steel vessels until bottling.
The winemaking team went one step further by dividing the Alluvium block into two sections, fermented separately using the stabulation method. One section developed tropical flavors: juicy mango and pineapple. The other expressed lime cream, minerals, and salinity. The final Alluvium Blanc is a blend of both, combining the wine's tropical brightness with its precise, mineral-driven structure.
Tasting Notes
The Alluvium Blanc shows a pale straw color in the glass. The nose opens with key lime and gooseberry, immediately clean and energetic, followed by Awapuhi ginger flower blossoms, wet stone, and Himalayan salt notes that support lifted white floral aromatics. On the palate, fresh acidity anchors a layered experience that evolves into saline, juicy Asian pear and oyster shell. Crisp, precise, and best served chilled.
Food Pairings
Alluvium Blanc was designed to be a food wine. Its crisp acidity, saline character, and layered fruit profile make it versatile across a range of dishes:
- Oysters and fresh shellfish
- Cheese and charcuterie boards (particularly with fresh goat cheese and Gruyère)
- Spring salads with citrus vinaigrette
- Risotto with herbs and light vegetables
- Grilled fish with lemon
The wine's mineral and saline qualities make it particularly well-suited to seafood, where the shared salinity creates a natural resonance. The acidity and citrus notes work equally well cutting through the richness of creamy pasta or a well-constructed cheese board.
Frequently Asked Questions
What is Alluvium Blanc?
Alluvium Blanc is a Bordeaux-style white wine produced by Beringer from Knights Valley grapes in Sonoma County. The name references the alluvial soils of Knights Valley, formed by ancient rivers. The wine is crafted in a cold, reductive style using stabulation and stored in stainless steel to preserve its aromatic freshness and mineral character.
What is the stabulation winemaking technique?
Stabulation is a cold pre-fermentation process in which freshly pressed juice is held at very low temperatures (around 30 to 32°F) and mixed daily for up to three weeks before fermentation begins. The cold environment slows enzymatic activity and preserves aromatic compounds that would otherwise oxidize or ferment away. The result is a wine with significantly more aromatic intensity and precision than conventional winemaking produces. Beringer uses stabulation for both the Alluvium Blanc and the Knights Valley Mountain Rosé.
What makes Knights Valley a good region for white wine?
Knights Valley is best known for Cabernet Sauvignon, but its combination of alluvial soils, mountain microclimates, and diurnal temperature variation also creates conditions favorable for expressive white wines. The rocky, well-drained soils stress the vines and concentrate flavor. The cooler nights preserve acidity and freshness. Together, these conditions produce whites with precision and aromatic intensity that warmer, flatter sites cannot replicate.
What food pairs best with Alluvium Blanc?
Alluvium Blanc pairs best with fresh seafood (particularly oysters and shellfish), light spring salads, cheese boards featuring fresh goat cheese or Gruyère, risotto with herbs, and grilled fish with citrus. Its saline, mineral character and bright acidity make it an especially strong match for briny or delicate ingredients that echo those qualities.
Want to understand the full Knights Valley white wine program? Read our post on Beringer's Knights Valley White Wines: From Crisp to Complex, which covers both the Alluvium Blanc and Mountain Rosé winemaking in depth.
