Tag: secondary 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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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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