Hey Lisa! Bread flour can be used to feed a sourdough starter but because it has a higher amount of starch, it may be a bit less active than described in this article. When creating a new sourdough culture, we do highly recommend starting initially with a whole grain flour, like whole wheat or rye. Whole grain flours have extra nutrients from the whole kernel that help provide the new starter an extra boost. We'd also recommend checking out our Sourdough Baking Guide. We hope this can help and happy baking! 

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