Using Self-Raising Flour in Sourdough Starter

Sourdough baking, with its rich history and artisanal charm, centers around the starter  a simple yet transformative mix of flour and water. One question that often surfaces, especially among budding bakers, is: Can self-raising flour be employed to nurture a sourdough starter? This in-depth guide aims to demystify this query.

Self raising flour can be used in sourdough starter as a last resort, however avoid long-term use. Self-raising flour, typically used for quick rise in baked goods, isn’t ideal for sourdough starters due to added raising agents and potential salt content which interferes with natural fermentation. 

What is Self-Raising Flour?

Before diving into its compatibility with sourdough starters, it’s crucial to understand what sets self-raising flour apart from regular bread flour:

Self-raising flour is essentially all-purpose flour with added raising agents, usually baking powder. This combination ensures that baked goods rise without needing additional leavening agents. It’s popularly used for recipes where a quick rise is desired, such as pancakes, muffins, and some cakes.

Why Consider Self-Raising Flour for a Sourdough Starter?

1. Availability: Some bakers might have self-raising flour on hand and think of using it for their starter, especially when other flours are scarce.

2. Curiosity: Baking is as much science as it is art. Using different ingredients and observing outcomes can be part of the joy of baking.

Challenges with Using Self-Raising Flour:

1. Raising Agents Interference:

Self-raising flour contains baking powder, a chemical leavening agent. This can react with the natural acids produced by the sourdough culture. The result is a potential interference with the fermentation process, as the natural balance between yeast and bacteria can be disrupted by these additional chemical reactions.

The chemical leaveners in self-raising flour can cause an exaggerated rise in your sourdough starter. This might give bakers a misleading impression of the starter’s genuine health and activity. Relying solely on the starter’s rise could lead to disappointing results in the final bread.

2. Salt Content:

Salt, when present in self-raising flour, can act as an inhibitor to the natural yeast and bacteria in a sourdough starter. Yeast and beneficial bacteria are sensitive to salt concentrations, and its presence can significantly slow down their activity.

Salt can also affect the taste of the starter. While salt is often added during bread making for flavor and to control fermentation, having it in the starter from the beginning can make it challenging to adjust the final salt content in your bread recipes.

3. Lack of Nutrients:

Self-raising flour is typically made from refined white flour. This means it lacks the bran and germ found in whole grain flours. These components not only provide nutrients for the yeast and bacteria but also contribute to a fuller, more complex flavor in the final bread.

A starter fed primarily with self-raising flour might not exhibit the same vigor or resilience as one maintained on whole grain flours. The absence of essential nutrients can lead to a less robust fermentation process, potentially affecting the texture, rise, and flavor of the bread.

Guidelines for Using Self-Raising Flour in a Sourdough Starter:

1. Avoid Long-Term Use:

The additives in self-raising flour are not naturally occurring in traditional sourdough starters. Over time, these additives can alter the microbial balance and health of the starter.

Relying solely on self-raising flour can deprive your starter of the essential nutrients it requires to thrive, which can result in reduced fermentation activity over time.

2. Monitor Closely:

Because of the additional leavening agents in self-raising flour, your starter may exhibit more rise than usual. It’s crucial to recognize this as potentially deceptive and not a true reflection of the starter’s health.

Regularly assess the aroma of your starter. If you notice an unusual or off smell, it might be an indication that the self-raising flour is not compatible or that there are imbalances in the starter’s microbial community.

3. Blend with Other Flours:

Mixing self-raising flour with nutrient-rich flours like whole wheat or rye can ensure that your starter receives a well-rounded diet. These flours can counteract the potential deficiencies posed by using self-raising flour alone.

By blending flours, you can also dilute the concentration of raising agents, potentially mitigating their adverse effects on the starter’s fermentation process.

4. Refresh More Often:

Increasing the frequency of feedings can help maintain a balanced microbial community in the starter. By introducing fresh flour and water more regularly, you can counteract any negative impact of the raising agents and keep the starter active.

More frequent feedings can also help maintain the ideal pH level in the starter, ensuring a favorable environment for beneficial microbes to flourish while discouraging unwanted bacterial growth.

5. Limit Salt Impact:

If you decide to use self-raising flour, opt for brands that don’t include salt. This will prevent unnecessary challenges posed by salt’s inhibitory effects on fermentation.

What can I do if I accidentally feed my sourdough starter with self raising flour?

If you’ve accidentally fed your sourdough starter with self-raising flour, don’t panic. Here are steps to help rectify the situation and ensure the continued health of your starter:

  1. Immediate Action: If you’ve just added the self-raising flour and realize your mistake, quickly remove as much of the newly added mix as possible.
  1. Dilution: Feed the starter with a greater quantity of the correct flour (like whole wheat or rye) to dilute the self-raising flour. This will help offset the added leavening agents.
  1. Increase Feedings: Feed your starter more frequently (possibly twice a day) with the appropriate flour to help stabilize it and encourage the growth of beneficial microbes.
  1. Monitor Activity: Keep a close eye on the starter’s activity. If it seems overly bubbly or frothy, it might be the effect of the raising agents. This should normalize after a few feedings with the correct flour.
  1. Sniff Test: Regularly smell your starter. An off or unusually strong smell might indicate an imbalance. A healthy starter should have a pleasantly tangy aroma.
  1. Separate: If you’re concerned about the health of your primary starter, take a small portion of it and feed this separately, creating a backup. This ensures you have a reserve if your main starter runs into trouble.
  1. Restart if Necessary: If, after several feedings, your starter still seems off-balance or inactive, consider starting fresh. Use a bit of the compromised starter with new flour and water to kickstart the process.
  1. Avoid Salt Issues: If the self-raising flour contains salt, this could slow fermentation. The increased feedings and dilution should help, but be prepared for the starter to be less active than usual for a while.

Remember, sourdough starters are quite resilient. With care and attention, you can usually bring them back to full health even after a misstep.


While it’s technically possible to use selfraising flour for a sourdough starter, it’s not the optimal choice due to its added raising agents and potential salt content. Those interested in experimenting should proceed with caution, monitor their starters closely, and ideally blend with other nutrient rich flours. Traditional flours like whole wheat or rye remain the gold standard for nurturing a robust and flavorful sourdough starter.


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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