What is sourdough?
Lesson 1 of 10
Sourdough is bread made by fermenting flour and water with a living culture of wild yeast and friendly bacteria, rather than relying only on commercial baker’s yeast.
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Lesson 1 of 10
Sourdough is bread made by fermenting flour and water with a living culture of wild yeast and friendly bacteria, rather than relying only on commercial baker’s yeast.
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A sourdough starter is a living mixture of flour and water that contains wild yeast and lactic acid bacteria, used to ferment and raise sourdough bread.
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That grey or brown liquid on your starter is usually hooch—a sign that the culture has run low on food.
Read the guideWhat You'll Learn When freezing makes sense. How to prepare starter for freezing. How to thaw and revive it. Why freezing can weaken activity temporarily. Why dried starter…
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A neglected starter can look terrible and still be recoverable. The key question is whether it is hungry—or contaminated.
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The 1:1:1 ratio is the simplest starter feed to understand and a useful baseline for learning how your culture behaves.
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The 1:2:2 ratio gives your starter more fresh food than 1:1:1, which usually creates a longer, more flexible fermentation window.
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More food is not always better. Feeding too soon can repeatedly dilute a weak culture before it has had time to ferment.
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You do not need a huge jar of starter. Keeping a small culture saves flour, reduces discard and is easier to maintain.
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A quiet starter is frustrating, but it is usually fixable. Work through temperature, feeding, flour and timing before assuming the culture has failed.
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