Tag: primary fermentation

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Common Winemaking Issues Part I: Stuck Fermentations

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Vinmetrica has been around since 2010 and over the past 16 years we have seen, heard, and learned about pretty much every common problem as it pertains to winemaking. Although we mostly help out with technical support using our Vinmetrica SC series systems, we do occasionally get a call about helping with winemaking issues. We cover many topics on our blog but we thought it might be a good idea to go through several of the most common problems we hear about. At our sister company, Little Oaks Winery, we have run into our fair share of problems too. Over the course of the next few months, we are going to visit and re-visit some of the most common winemaking issues and discuss how to prevent, diagnose, and how to move forward with a plan to turn the fate of your wine around.

We will cover topics like oxidation, off flavors, and haze issues but first we thought it best to go over stuck fermentations. Harvest is coming soon and this is one of the most common issues we hear about and see on winemaking forums and guides. If we missed anything, please do let us know in the comments below.

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Stuck Fermentations: How to Prevent, Diagnose, and Restart Primary and Secondary Fermentations
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Importance of Grapes in winemaking

close up of hundreds of red grape clustersWhen it comes to making exceptional wine, it’s easy to focus on the equipment, techniques, and chemistry in the cellar. But seasoned winemakers know the truth: great wine isn’t made—it’s grown.

The quality of your vineyard and grapes sets the foundation for everything that follows. No amount of adjustment or analysis can fully compensate for poor fruit, while high-quality grapes often require less intervention and yield more expressive, balanced wines.

Every vineyard has its own unique combination of soil, climate, elevation, and sun exposure. These factors shape how grapes develop, influencing sugar levels, acidity, tannins, and aromatic compounds.

Grapes grown in well-suited vineyard sites tend to ripen more evenly and develop greater complexity. Balanced conditions—neither too harsh nor too fertile—encourage vines to produce fruit with concentrated flavors rather than excessive yields.

It’s important to evaluate the vineyard as a whole—ensuring the fruit is ripening properly and that the grower is actively managing the vines to prevent damage. While we have limited experience growing grapes ourselves, we’ve spent many harvests hand-picking and have seen our fair share of both care and neglect.

If you are a newer home winemaker and are using one of the many wine kits available, these are generally set up so that you can get through primary fermentation without any adjustments or additions. It is common for pH and TA measurements to be supplied by the maker of the kit.

How Testing Fits In

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Stuck Fermentations

Primary Fermentation

Stuck primary fermentations in winemaking refer to a situation where the fermentation process slows down or stops before all the available sugars are converted into alcohol and carbon dioxide. This can be a common challenge for winemakers and may result in an incomplete or unbalanced wine. Several factors can contribute to stuck fermentations, and it’s essential to identify and address them promptly.

Common Causes of Stuck Fermentations:

    1. Temperature Fluctuations: Yeast activity is highly sensitive to temperature. If the temperature is too low, the yeast may become sluggish or dormant. Conversely, if it’s too high, it can stress the yeast and lead to stuck fermentation.
    2. Nutrient Deficiencies: Yeast requires various nutrients to thrive, such as nitrogen, vitamins, and minerals. A lack of essential nutrients can hinder yeast metabolism and lead to a stuck fermentation.
    3. Inadequate Aeration: Yeast needs oxygen during the early stages of fermentation. Insufficient aeration can limit yeast growth and fermentation progress.

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