Making Wine from Viognier Grapes

Introduction to Viognier

Viognier is one of the most seductively aromatic white grape varieties in the world, producing wines of extraordinary floral perfume, stone fruit richness, and lush, oily texture. Once nearly extinct, this grape has staged a remarkable comeback and now captivates winemakers and wine lovers across the globe. For home winemakers, Viognier offers the chance to produce wines of stunning aromatic beauty, though it demands careful attention at every stage.

Historical Background

Viognier's origins remain debated, but the grape has been most closely associated with the Northern Rhone Valley of France for centuries. Its ancestral home is the tiny appellation of Condrieu, where steep granite terraces overlooking the Rhone River produce some of the most expensive and sought-after white wines in France.

By the 1960s, Viognier was nearly extinct. Plantings in Condrieu had dwindled to barely 8 hectares (about 20 acres), and the grape seemed destined for obscurity. A revival began in the 1980s and accelerated through the 1990s as winemakers in California, Virginia, Australia, and other regions recognized Viognier's extraordinary potential. Today, global plantings exceed 15,000 hectares.

The Appeal for Home Winemakers

Viognier appeals to home winemakers who want to produce aromatic, full-bodied white wines that stand apart from the more common Chardonnay or Sauvignon Blanc. The grape's intense perfume of apricot, peach, and white flowers creates an immediately impressive wine that requires no oak aging to deliver complexity. However, Viognier's tendency toward low acidity and susceptibility to oxidation require careful management.

Growing Conditions and Grape Selection

Climate Requirements

Viognier needs warmth to ripen fully and develop its signature aromatic compounds. The grape thrives in warm, dry climates with plenty of sunshine -- it performs poorly in cool, damp conditions where it fails to reach aromatic maturity. However, excessive heat causes the grape to lose its delicate floral aromatics, trading perfume for heaviness.

Ideal growing regions provide warm days and moderately cool nights with minimal rainfall during the ripening period. In the United States, successful Viognier plantings exist in Virginia (which has made it a signature grape), California's Central Coast, Washington State, and Texas Hill Country.

Selecting and Evaluating Grapes

Viognier presents a narrow harvest window -- the period between underripe and overripe is shorter than most varieties. Target grapes at 23-25 Brix with a pH of 3.3-3.6 and TA of 5.5-7 g/L.

The grape's naturally low acidity is its greatest winemaking challenge. If possible, verify the acid levels before purchasing and be prepared to make acid additions if the TA falls below 5.5 g/L.

Look for grapes with:

• Deep golden-green color indicating full ripeness
• Intense aromatic character when you crush a berry between your fingers
• Firm, intact berries without signs of dehydration or raisining
• Clean clusters free from botrytis (Viognier is susceptible to rot)

Yield Considerations

Viognier is notorious for irregular yields. The grape tends toward poor fruit set, meaning clusters may be sparse with many shot berries (small, seedless berries). While low yields concentrate flavors and produce more intense wines, they also mean you may need more vine production than expected to fill your fermenter.

Winemaking Process

Crushing and Skin Contact

Unlike many white wines, Viognier actually benefits from a period of cold skin contact before pressing. The grape's most complex aromatic compounds (monoterpenes) are bound in the skins, and a maceration period of 8-18 hours at 45-50 degrees Fahrenheit releases these precursors into the juice.

Add 30-40 ppm sulfite at crushing to protect against oxidation. Some winemakers also add a small amount of ascorbic acid (50 mg/L) as an additional antioxidant, though this must always be used in conjunction with sulfite.

After skin contact, press gently. Viognier's thick skins require moderate pressure to extract juice efficiently, but avoid aggressive pressing that extracts bitter seed tannins.

Juice Handling and Acid Adjustment

Viognier juice is typically low in acidity compared to other white varieties. Measure the TA and pH immediately after pressing. If the TA is below 6 g/L or the pH is above 3.5, add tartaric acid to bring the numbers into range.

A typical adjustment involves adding 1-3 grams of tartaric acid per liter of juice. Make the addition before fermentation and verify with a test kit. Proper acidity is critical -- without it, Viognier becomes flabby and loses its vibrancy.

Cold settle the juice at 45-50 degrees Fahrenheit for 24-48 hours, but retain more lees than you would for lighter whites. The slightly cloudy juice supports yeast nutrition and contributes to Viognier's characteristically rich mouthfeel.

Yeast Selection

Choose yeasts that enhance Viognier's aromatic potential:

• Lalvin CY3079: Burgundy isolate that enhances mouthfeel and releases complex aromatics. Excellent for Viognier.
• Lalvin ICV D47: Produces rich, creamy wines with enhanced varietal character. Keep fermentation below 64 degrees Fahrenheit.
• Lalvin QA23: Good for emphasizing fresh fruit and floral notes in a lighter style.
• Anchor VIN7: South African strain that maximizes thiol and terpene expression.

Rehydrate yeast with Go-Ferm according to manufacturer directions.

Fermentation Management

Viognier fermentation temperature presents a balancing act. Too cool (below 55 degrees Fahrenheit) and the wine lacks the textural richness expected from this grape. Too warm (above 68 degrees Fahrenheit) and delicate floral aromatics are lost.

The ideal fermentation temperature for Viognier is 57-64 degrees Fahrenheit (14-18 degrees Celsius). This range preserves aromatics while allowing enough yeast metabolic activity to build mouthfeel and complexity.

Follow a staggered nutrient addition protocol, as Viognier's low-nitrogen juice can cause fermentation problems:

1. Add nutrients at yeast pitching with Go-Ferm
2. Add Fermaid-O at first signs of active fermentation
3. Add final nutrient dose at one-third sugar depletion

Fermentation typically takes 2-4 weeks at the recommended temperature range. Monitor daily and ferment to complete dryness unless you are intentionally leaving residual sugar.

Flavor Profile and Stylistic Choices

Aromatic Characteristics

Viognier's aromatics are its defining feature. Expect:

• Stone fruit: Ripe apricot, white peach, nectarine, mango
• Floral: Honeysuckle, orange blossom, acacia, gardenia, violet
• Tropical: Tangerine, papaya, lychee
• Other: Ginger, musk, beeswax, honey, white pepper

The wine's low acidity and full body create a lush, almost oily texture on the palate that distinguishes it from lighter whites.

Oak Fermentation and Aging

Viognier has a natural affinity for oak fermentation and aging. Barrel-fermented Viognier gains additional complexity -- vanilla, toast, cream, and spice notes integrate seamlessly with the grape's rich fruit character.

If using oak, choose French oak with a light to medium toast. Ferment 30-50% of the wine in barrel and the remainder in stainless steel, then blend to taste. Limit oak aging to 4-8 months to avoid overpowering the grape's delicate floral perfume.

For home winemakers without barrels, French oak alternatives (staves, spirals, or cubes) at light to medium toast provide similar results. Use 1-2 ounces per gallon and taste monthly.

Malolactic Fermentation

Viognier is one white variety where malolactic fermentation is often encouraged. MLF rounds out the wine, adds buttery complexity, and enhances the creamy mouthfeel that defines great Viognier. Inoculate with a reliable MLF culture such as VP41 after primary fermentation if you choose this path.

However, if your grapes were already low in acidity, skip MLF to preserve what acid remains. The decision depends entirely on your starting acid levels and desired style.

Post-Fermentation and Aging

Lees Management

Viognier benefits significantly from extended lees contact. Keep the wine on fine lees for 3-6 months with gentle stirring (batonnage) every 1-2 weeks. This technique builds mouthfeel, reduces the risk of premature oxidation, and contributes toasty, bready complexity.

Protecting Against Oxidation

Viognier is one of the most oxidation-prone white varieties. Its low acidity and high phenolic content make it susceptible to browning and loss of fresh aromatics. Maintain adequate sulfite levels throughout aging, minimize headspace in all containers, use inert gas when racking, and limit the number of transfers.

Bottling

Bottle Viognier 6-10 months after harvest. While some winemakers age Viognier longer, the grape's aromatics are at their most vibrant in youth. Use quality closures and target 30-40 ppm free SO2 at bottling. Most Viognier is best consumed within 2-3 years of bottling, though well-made examples with good acid balance can develop nicely for 5+ years.

Food Pairing Suggestions

Viognier's rich texture and aromatic complexity make it a standout pairing partner:

• Roasted poultry: Roast chicken with herbs, turkey with apricot glaze
• Seafood: Lobster, crab cakes, scallops, rich fish like halibut or monkfish
• Asian cuisine: Thai coconut curries, Vietnamese dishes, Chinese stir-fries
• Cheese: Soft, creamy cheeses like Brie, Brillat-Savarin, or triple-cream varieties
• Stone fruit dishes: Grilled peaches, apricot tarts, fruit chutneys
• Spiced dishes: Moroccan tagines, mild Indian curries, dishes featuring ginger or saffron

Frequently Asked Questions

What makes Viognier challenging for home winemakers?

Viognier's main challenges are its low natural acidity, narrow harvest window, and susceptibility to oxidation. The grape can go from underripe to overripe in just a few days, and once harvested, it requires careful acid management and diligent protection from oxygen throughout the winemaking process. However, these challenges are manageable with planning and attention.

Should I co-ferment Viognier with red wine?

Interestingly, a small percentage of Viognier (2-5%) is traditionally co-fermented with Syrah in the Northern Rhone. The Viognier contributes floral aromatics and helps stabilize Syrah's color through a process called copigmentation. If you are making Syrah, consider adding a small amount of Viognier must at the start of red fermentation for added complexity.

How do I prevent Viognier from turning brown?

Prevent oxidation by adding sulfite immediately at crushing, using ascorbic acid (50 mg/L) as an additional antioxidant, minimizing headspace, using inert gas during transfers, and maintaining adequate free SO2 throughout aging. Work quickly during racking and avoid splashing. Extended lees contact also provides some protection against oxidation.

What acid should I add to low-acid Viognier?

Tartaric acid is the preferred addition for Viognier and all grape wines. It is the dominant natural acid in grapes and integrates most naturally with the wine's flavor profile. Add before fermentation, dissolve in a small amount of juice first, mix thoroughly, and retest after 24 hours before making additional adjustments.

Can Viognier be made in a lighter style?

Yes. For a lighter Viognier, harvest earlier (21-22 Brix), minimize skin contact, ferment at cooler temperatures (52-57 degrees Fahrenheit), skip MLF, use no oak, and add acid as needed to brighten the palate. The result will be more restrained than classic Viognier but can be refreshing and food-friendly.

How does Viognier compare to Chardonnay?

Both are full-bodied white wines, but they differ significantly. Viognier is more aromatically intense, with pronounced floral and stone fruit perfume. Chardonnay is more neutral aromatically but excels at reflecting terroir and oak treatment. Viognier is naturally lower in acidity than Chardonnay and typically requires less winemaking intervention to achieve aromatic complexity.

What is the ideal serving temperature for Viognier?

Serve Viognier slightly warmer than most white wines, at 50-55 degrees Fahrenheit (10-13 degrees Celsius). Too cold, and the wine's gorgeous aromatics are muted. Too warm, and the low acidity makes the wine feel heavy and flat. Let the wine warm slightly in the glass to fully appreciate its aromatic complexity.