Quick Answer
Fermentation temperatures that drop too low can slow down or stop the fermentation process, leading to an over-acidification of the vegetables and potentially creating an environment where unwanted bacteria or mold can grow.
Temperature Requirements
Lacto fermentation typically thrives between 64°F (18°C) and 73°F (23°C). Temperatures below 55°F (13°C) can significantly slow down the fermentation process. If the temperature drops below 40°F (4°C), the fermentation process can come to a near-halt, and unwanted bacteria may begin to grow.
Effects of Low Temperatures
At temperatures below 55°F (13°C), the activity of beneficial lactic acid bacteria decreases. This can lead to an over-acidification of the vegetables, causing them to become too sour. Additionally, low temperatures can cause the vegetables to become soggy, leading to an unpleasant texture. If the temperature drops too low, it may be necessary to move the fermentation vessel to a warmer location or use a heating source to maintain a consistent temperature.
Strategies for Maintaining Temperature
To maintain a consistent temperature during lacto fermentation, consider the following strategies: relocate the fermentation vessel to a warmer location, such as a pantry or cupboard; use a heating source, such as a thermometer-controlled heating pad or a warm water bath; or use a temperature-controlled fermentation vessel, such as a fermentation crock with built-in temperature control. It’s essential to monitor the temperature regularly to ensure that it remains within the optimal range for lacto fermentation.
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