Keeping a Sourdough Starter Alive
Maintaining a starter is about establishing a rhythm of feeding that matches the temperature of your kitchen. By replacing a portion of the old culture with fresh flour and water, you provide the yeast and bacteria with the fuel they need to remain active and healthy for years.
Consistency is the only secret.
Your starter is a living colony that reacts to its environment; it will grow faster in a warm room and slower in the cold. You do not need to be a chemist, but you must be observant of how it rises and falls.
- Glass jar with a loose-fitting lid
- Digital kitchen scale
- Silicon spatula
Managing Volume
Removing a portion before feeding prevents you from ending up with gallons of starter. It forces the fresh flour to be consumed by a smaller, more concentrated population of yeast.
The method.
Discard the bulk
Leave about 50 grams of the mature starter in your jar. Scraping the sides clean helps you see the progress of the next rise.
Add fresh fuel
Add 50 grams of room-temperature water and 50 grams of flour to the jar. Stir until no dry patches remain and the texture is thick like heavy paste.
Monitor the rise
Place a rubber band around the jar at the level of the starter. When it doubles in volume and the surface is covered in small, bubbly craters, it is at peak activity.
Store or feed
If you are baking today, use it at peak. If not, put it in the refrigerator to slow the fermentation down until your next feeding cycle.
When it doesn't go to plan.
A dark layer of liquid on top, known as hooch, is a sign your starter is hungry and needs to be fed sooner.
Use unbleached bread flour or a mix of rye flour to provide more nutrients, which usually results in a more vigorous rise.
If your kitchen is cold, keep the jar near the oven or inside a turned-off microwave to keep the temperature steady.
The ones that keep coming up.
How often do I actually have to feed it?
If kept on the counter, it needs feeding every 24 hours. If kept in the fridge, once a week is sufficient.
How do I know if it has gone bad?
A healthy starter smells like yogurt, vinegar, or mild fruit. If it develops fuzzy mold on the surface or emits a harsh, chemical odor like nail polish remover, it is time to discard and start fresh.
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