Quick Answer
Which should I use?
Use organic (bio) flour when you want more flavour complexity, slightly higher micronutrient and fiber content, and when minimizing pesticide exposure matters. Use conventional flour when you need consistent milling, lower price, and very predictable dough behavior. In everyday sourdough baking both perform well; differences are subtle and manageable with technique[1][2].
🛒 Recommended Products
We recommend the following tools for this recipe:
Digital Kitchen Scale
Essential for accurate baker's percentages and conversions between flours
Banneton Proofing Basket
Helps retain shape and moisture for higher-hydration organic doughs
Dutch Oven or Cast Iron Pot
Provides reliable steam and crust development for both flour types
Dough Scraper/Bench Knife
Useful for gentle handling of softer organic flour doughs
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Comparison Table
| Property | Option A | Option B | Significance |
|---|---|---|---|
| Crop & Farming | Organic (bio): No synthetic pesticides/fertilizers | Conventional: May use synthetic inputs | Affects trace residues and farming sustainability[2] |
| Microbial Load | Often higher and more diverse | Lower diversity due to processing and treatments | Can contribute subtle differences in starter behaviour and aroma[1][2] |
| Nutrient & Mineral Content | Often slightly higher (varies by batch) | Consistent but may be marginally lower | Small effects on flavor and crumb; not a substitute for whole-grain choice[1] |
| Milling Consistency | Can be less uniform between batches | Typically very consistent | Conventional eases precision recipes; organic may need small hydration tweaks |
| Flavor / Aromatics | Tends toward more complex, variable flavor | Neutral, consistent flavor | Organic can add desirable nuance to sourdough[1] |
| Price | Higher per kg | Lower per kg | Consider budget for frequent baking |
| Availability | Good, but specialty types less common | Very good; wide variety and types | Conventional easier to source specific extraction rates |
| Water Absorption | May vary; whole-grain organic often absorbs more | Predictable by brand/type | Expect small hydration adjustments (≈1–4%) |
When to Use Which?
Organic flours sometimes introduce more native microbes, which can help diversity; keep consistent feeding once active[1][2]
Subtle aromatic and mineral notes in organic flours complement long fermentations[1]
Conventional flours deliver consistent milling and hydration behaviour between batches
Lower cost per loaf while still producing excellent sourdoughs
Avoiding synthetic residues and supporting different agronomy practices[2]
Can I Mix Both?
Can I Mix Them?
Yes — mixing organic and conventional flours is a practical way to balance flavor, cost, and consistency. Many bakers blend to get the character of organic with the predictability of conventional[1]. When mixing, weigh ingredients on a [digital kitchen scale](https://amzn.to/4pUMVHi) and make a small test loaf.
Converting Recipes
A → B
Flour: Replace 1:1
Water: Start with same hydration, then adjust +1–4% if organic whole-grain is used
→ Likely more flavour, potentially stickier dough; use a [dough scraper](https://amzn.to/3LR1f5E) for gentle handling
B → A
Flour: Replace 1:1
Water: If switching to conventional, reduce hydration by ~1–3% if dough feels overly slack
→ More predictable fermentation and handling
💡 When trying a new batch, do a 100 g test dough or a 250 g levain build, monitor rise with a [clear straight-sided container](https://amzn.to/3LROhV5) and use an [instant-read thermometer](https://amzn.to/49Xsgwp) to track temperature[1][2].