All-Purpose Flour in Sourdough Starters: Suitable?

At its core, a sourdough starter is a mixture of flour and water that captures wild yeasts and bacteria from the environment. This natural fermentation process produces carbon dioxide gasses to make the bread rise and it also imparts a tangy flavor synonymous with sourdough bread. While there are various flours available for making sourdough starters, the choice of flour can impact the starter’s health, vigor, and resulting bread’s flavor. As sourdough baking continues to rise in popularity, one question many budding bakers ask is whether they can use all-purpose flour for their sourdough starter. 

All-purpose flour is suitable for sourdough starters, but starters made from it tend to be weaker than those made with whole grain flour. Thus, regular feedings are crucial to maintain a robust starter when using all-purpose flour. Feed the starter with whole grain flour every month to maintain a vigorous culture.

Advantages of Using All-Purpose Flour for Sourdough Starter:

1. Affordability

All-purpose flour is often less expensive than specialty or whole grain flours, making it an economical choice for maintaining a regular feeding schedule for your sourdough starter.

2. Accessibility

Almost every grocery store carries all-purpose flour, ensuring that you can easily replenish your stock whenever needed. Its widespread availability makes it convenient for most bakers.

3. Milder Flavor

Some bakers appreciate the neutral flavor that all-purpose flour brings to a sourdough starter. This neutrality can be especially useful when the baker wants other ingredients in the bread, like fruits or spices, to shine through without being overshadowed by the tang of the sourdough.

4. Predictability

All-purpose flour offers consistency batch after batch. This can be particularly advantageous for those who are new to sourdough baking, as it reduces the variables they need to consider while learning.

Considerations When Using All-Purpose Flour in Sourdough Starter:

1. Nutrient Density

Being refined, all-purpose flour lacks the nutritional richness of whole grain flours. The microorganisms in a sourdough starter thrive on these nutrients. Consequently, while a starter with all-purpose flour can be healthy, it might not exhibit the same vibrancy or speed of fermentation as one made with whole grain flours.

2. Recipe Adjustments

Using an all-purpose flour starter in recipes that were crafted for starters with a different flour base can require tweaks. For instance, hydration levels, bulk fermentation times, and even flavor pairings might need adjustments to get the desired results.

3. Moderate Gluten Content

All-purpose flour’s gluten content is typically in the middle range. While sufficient for many breads, certain recipes that demand robust gluten networks might benefit from incorporating stronger flours in the final dough mix.

4. Evolution Over Time

If consistently fed with all-purpose flour, a starter might evolve to favor lactic acid bacteria over acetic acid bacteria, leading to a milder, creamier tang rather than a sharp sourness. This evolution can be delightful for some but unexpected for those desiring a more pronounced sour note.

Tips for Using All-Purpose Flour in Your Sourdough Starter:

1. Regular Feeding

Maintaining a consistent feeding schedule is essential when using all-purpose flour. Since it lacks the nutritional depth of whole grains, it’s vital to replenish the food source for the yeast and bacteria frequently to ensure ongoing fermentation activity.

2. Consistency Matters

All-purpose flour has a different absorption rate than whole grains. Keep an eye on the consistency of your starter. It should be thick yet stirrable, resembling a thick batter or pancake mix. If it appears too thick or too thin, make slight adjustments in the water or flour during the next feeding.

3. Observe and Adjust 

Sourdough starters are living entities, and their behavior can change based on numerous factors. If you notice your starter isn’t bubbling as much or rising sufficiently, consider introducing a feeding with whole grain flour to invigorate it. Alternatively, if you can’t get whole grain flour, refrigerate the starter to reduce its metabolism. This conserves its strength until you can refresh it adequately.

4. Hydration Levels 

While many sourdough bakers prefer maintaining their all-purpose flour starter at 100% hydration, don’t hesitate to adjust based on your observation and preference. Some bakers find that a slightly thicker or thinner starter works best for their specific baking conditions and routines.

5. Maintain Starter Cleanliness

All-purpose flour, being refined, might lack some of the natural defenses against contamination found in whole grains. Ensure that the jar or container you use to store your starter is clean. Avoid introducing foreign substances or using utensils that haven’t been cleaned.


All-purpose flour is not only a viable choice for sourdough starters but also a practical one, especially for those new to the sourdough world. While it might offer a different flavor and activity level compared to whole grain flours, with proper care and understanding, it can yield delightful sourdough breads. Remember, sourdough baking is as much about intuition and experience as it is about ingredients. So, embrace the process and enjoy the delicious results!


Hey there! I'm Sam, your go-to pal for all things sourdough. I've been baking and kneading for 10 fun-filled years, and I can't wait to share the joy of turning simple ingredients into heavenly sourdough bread with you. Grab your apron and let's dive into this amazing world of sourdough bread together on this blog.

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