Fermentation Vessels Can Affect the Flavors of a Wine

In a recent blog, I listed some of the many factors that can affect a wine’s flavors. One of the factors is the type of vessel chosen by the winemaker to ferment the wine. So, let’s take a closer look.

The three most common fermentation vessels are made of either oak, stainless steel or concrete. Each of these can affect the flavor of the wine due to the degree to which the wine is exposed to oxygen.

Fermentation in Oak 
Oak fermentation barrels allow for the gradual influx of oxygen which helps to softened tannins and acid while developing a ‘rounder’ more balanced wine. Oak itself also imparts flavors. French oak is known to yield more subtle flavors like clove and spice to a wine while creating a silkier, smoother mouthfeel, while American oak typically imparts aromas of vanilla and coconut. And, the degree to which these flavors are imparted varies by the level of ‘toast’ created on the barrel during its production. So, for instance, a barrel with a ‘medium’ toast will impart less flavors than a barrel with a heavy toast. Finally, once an oak barrel has been used three to four times, the majority of the flavors have been extracted and it becomes a ‘neutral’ barrel that imparts little to no flavors.

Fermentation in Stainless Steel

Unlike oak, stainless steel fermentation vessels can be tightly sealed so as to allow little to no oxygen exposure of the wine during the fermentation process. And, a winemaker may fill the top of the tank (the headspace) with inert gas to drive out all of the oxygen. This makes for brighter, fresher fruit-forward wines. The stainless steel imparts no flavor characteristics to the wine. Stainless steel tanks are also used because they offer optimal refrigeration capabilities when a winemaker wants to cold-ferment the wine.

Fermentation in Concrete

Concrete-type vessels have been used to ferment wine for as long as wine has been made. Concrete tanks can be open for oxygen exposure, or sealed like stainless steel to avoid oxygen. The concrete itself is quite neutral so it doesn’t impart significant flavors like oak, but it can add mineral-like flavors to the wine.

Behind the Cork™ - Wines of Chile Sustainability, Part 3

This is the third of three Behind the Cork™ features highlighting Chilean wines that collectively underline Chile’s historic commitment to sustainable wine growing. Their focus on sustainability includes environmental, social, and economic.

The first posting included a Cabernet Franc and a Cabernet Sauvignon. The second posting featured a red blend and a Carmenere.

Here are two more excellent examples of high-quality, affordable and sustainable wines coming from Chile.

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2019 Viña Tarapacá Gran Reserva ($20)

Farmed since 1874 in Isla de Maipo, Chile’s traditional vinous heart, this estate is known for its diversity of soils that enable it to successfully grow an array of grapes. This five-grape variety wine (31% Cabernet Franc, 26% Syrah, 22% Carmenere, 11% Merlot and 10% Cabernet Sauvignon) are organically grown. It spent 12 months aging in American and French oak. It has upfront notes of wild herbs, flowers, ripe black fruit along with subtle vegetal notes from the Cabernet Franc and lavender and violet notes from the Merlot.

Sustainability Pillar: Planting more than 11,000 native trees and shrubs to restore the natural environmental balance and reconnect the biological corridors between the Altos de Cantillana mountains and the River Maipo through the estate’s 5,000 acres of vineyards.

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2019 Viu Mament Secreto de Viu Manent Malbec ($15)

Family-owned since 1935, Colchagua Valley-based Viu Manent is one of the most respected wineries in Chile. The family has fun with the line of “Secreto” wines – a stated grape variety with a “secret blend” (15%) of other grapes. The Malbec grapes come from 19 year-old vines. Fresh and fruity, the final blend offers a mix of red berries and violets on the palate.

Sustainability Pillar: Installation of four solar plants that generate 460 kilowatts at peak, implementation of a biodiversity protection program as Central Chile is home to more than 50% of the various species of floral and vertebrates in the country, and recycling (such as using old barrels in promotions or by local artists).


Disclosure of Wine Sample Submission: I received these samples at no cost for review. The opinions expressed are entirely my own.

Samples Provided by Creative Palate Communications