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A well-developed sourdough should be able to generate a micro climate within his jar that supresses other growth like mold. This holds especially true for "old", well-established strains. We (1) use a sourdough strain that's been cultivated for at least 20 years. (After that, history becomes a bit murky...) Young sourdough is the most susceptible to ...


My sourdough starter has grown mold on top or on the sides of the jar. What should I do? While mold is fairly uncommon when working with a sourdough starter, it does occasionally happen and is generally caused by either contamination (soap or food residue are the most common) or weakened yeast (skipped feedings, improper ratios, etc.). ...

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