Quick Answer
If your sourdough starter isn't rising properly, it may be due to inadequate temperature, incorrect feeding, or insufficient activity. Check the starter's temperature, feeding schedule, and overall health to troubleshoot the issue. Consider reviving the starter by discarding it and starting over.
Reevaluating the Starter’s Environment
Check the temperature of your sourdough starter, aiming for a range between 75°F and 78°F (24°C to 25.5°C) for optimal activity. If the temperature is too low or too high, it may affect the starter’s rise. Ensure your workspace is draft-free and at a consistent temperature to support the starter’s development.
Starter Feeding and Health
Examine your feeding schedule, making sure to discard half of the starter and replenish it with equal parts of flour and water at least once a day. If the starter is not bubbly, frothy, or nearly double in size after a 4- to 6-hour period, it may be underactive. Try adding a pinch of sugar or a tiny amount of active yeast to encourage fermentation.
Reviving a Dormant Starter
If the starter shows little to no signs of life after a week or more, it’s likely time to start over. Discard the starter and create a new one using a small amount of active yeast or a healthy starter culture. Mix equal parts of flour and water (around 1/2 cup each) and let the mixture sit in a warm, draft-free area for 24 to 48 hours, allowing the yeast to grow and colonize the mixture.
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