
Creating and maintaining a sourdough starter is a straightforward process of capturing wild yeast and beneficial lactic acid bacteria using only flour and water.
Creating Your Starter (Days 1–7)
To start, you will need a glass jar, a digital scale, non-chlorinated water, and whole-wheat or rye flour (which contains more natural wild yeasts than refined white flour).
- Day 1: Initial Mix
Establishes the foundation
Combine 50g whole wheat flour and 50g warm water (80°F/27°C) in a clean jar. Stir thoroughly until no dry flour remains. Cover loosely with a lid or cloth secured with a rubber band, and store in a warm spot (75–80°F) for 24 hours. - Day 2: First Observation
Allowing microflora to acclimate
You may see a few small bubbles, or no activity at all. Do not feed today. Simply stir the mixture, cover loosely, and return it to its warm spot for another 24 hours. - Day 3–5: Begin Daily Feedings
1:1:1 Ratio feeding schedule
Discard all but 25g of your starter. Add 25g flour (unbleached all-purpose or a 50/50 mix with whole wheat) and 25g warm water. Stir well, cover loosely, and repeat every 24 hours. Bubbles and a sour aroma will begin to develop. - Day 6–7: Establishing Peak Activity
Indicators of a mature starter
Continue daily 1:1:1 feedings. By day 7, the starter should double in volume within 4–6 hours of feeding, show a spongy, web-like bubble structure throughout, and smell pleasantly tangy and fruity rather than harsh or solvent-like.
Daily & Room-Temperature Maintenance
Once mature, your feeding schedule depends on how frequently you plan to bake.
- Ratio: Maintain a standard 1:1:1 ratio (equal parts by weight of starter, flour, and water) for daily room-temperature storage. For example, 30g starter + 30g flour + 30g water.
- Timing: Feed at the same time every day. If your kitchen is warm and the starter peaks and falls too quickly, increase the ratio to 1:2:2 (e.g., 20g starter + 40g flour + 40g water) or 1:3:3 to slow down fermentation.
- Consistency: Always use a scale rather than volume measurements. Water weighs twice as much as flour by volume, so measuring by cups creates an overly wet batter that suppresses yeast activity.
Refrigerator Storage (For Occasional Bakers)
If you bake once a week or less, storing your starter in the refrigerator saves flour and time:
- Feed your starter at a 1:1:1 or 1:2:2 ratio.
- Let it sit at room temperature for 1–2 hours until you see initial bubbling.
- Seal the jar tightly and place it in the refrigerator.
- Feed it at least once every 7 to 10 days to keep the culture healthy.
- To bake: Pull it out 24–36 hours before baking and perform 2 consecutive room-temperature feedings to restore full rising power.
Essential Maintenance Tips
- Water Quality: Tap water treated with chloramine or heavy chlorine can kill wild yeast. Use filtered, spring, or distilled water.
- Temperature Control: Fermentation speed is directly tied to temperature. Ideal starter culture activity occurs between 75°F and 80°F (24°C–27°C).
- Managing “Hooch”: A clear or dark liquid floating on top indicates your starter is hungry and has consumed its food supply. Pour it off (or stir it back in for extra sourness) and feed immediately.
- Signs of Mold: Pink, orange, or green streaks/fuzz mean harmful bacteria or mold have taken over. Discard the entire batch, sanitize the container thoroughly, and start fresh. Happy Baking!



















