How to make homemade sourdough starter and maintain regular feedings
Making a sourdough starter is a simple, rewarding kitchen project that captures wild yeast and beneficial bacteria to leaven bread. With just flour, water, and a little patience you can build a lively culture and keep it healthy with regular feedings. Follow the step-by-step routine below to create and maintain a starter that will power many loaves.
Step 1: Gather supplies and ingredients
Use a clean glass or plastic container of at least 1 liter capacity, a kitchen scale, a spoon or spatula, and a breathable cover like a cloth or loose lid. Measure by weight for consistency: start with unbleached all-purpose or bread flour and filtered or bottled water to avoid chlorinated tap water that can inhibit fermentation.
[Illustration: kitchen scale, glass jar, cloth cover, bowl of flour and water on countertop]
Step 2: Day 0: Mix initial starter
Combine 50 grams flour and 50 grams water (1:1 by weight) in the jar, stir until uniform, and scrape down the sides. The mixture should be thick like pancake batter; label with the date and leave at room temperature between 21-26°C (70-79°F) for 24 hours to allow wild yeast to begin colonizing.
[Illustration: jar with pale batter-like mixture and date label on cool kitchen counter]
Step 3: Day 1-3: Watch for bubbles
Each day discard half the starter (about 50 grams) and feed with 50 grams fresh flour and 50 grams water, stirring well. Expect small bubbles, a tangy smell, and slight rise by day 2 or 3; continued feedings encourage yeast growth while keeping acidity balanced to prevent harmful bacteria.
[Illustration: jar with bubbling starter and spoon beside it, visible small bubbles on surface]
Step 4: Day 4-6: Increase activity
Continue the twice-daily routine if growth is slow, otherwise switch to once every 24 hours if starter doubles in height within 6-8 hours after feeding. Use 50 g flour + 50 g water after discarding half; doubling and a pleasant sour aroma indicate the culture is strengthening and nearing readiness for baking.
[Illustration: starter risen to double height in jar next to measuring scale]
Step 5: Readiness test: float check
When the starter consistently doubles within 6-8 hours, perform a float test by dropping 1 teaspoon into room-temperature water; if it floats, it’s aerated and ready to leaven bread. If it sinks, continue regular feedings for a few more days until buoyancy and a fruity, mildly sour smell appear.
[Illustration: small spoonful of bubbly starter floating in a clear bowl of water]
Step 6: Regular maintenance: keep a schedule
For frequent baking, feed the starter daily: discard half and add 50 g flour + 50 g water once every 24 hours. Store at room temperature for active use or move to the refrigerator for lower-maintenance weekly feedings; refrigerate in a sealed jar and feed once every 7 days by discarding half and adding 100 g flour + 100 g water to wake it up.
[Illustration: labeled jars in fridge and on countertop with feeding schedule note]
Step 7: Revive and adjust before baking
If refrigerated, bring the starter to room temperature and give two feedings 12 hours apart (discard half, then add equal parts flour and water by weight) before using in dough. To increase strength quickly, use a higher-feeding ratio such as 1:4:4 (starter:flour:water by weight) and keep at 24-26°C (75-79°F) for faster activity.
[Illustration: jar at room temperature being fed with measured flour and water on scale]
- Use equal-weight feedings for predictability; 50 g starter + 50 g flour + 50 g water keeps ratios simple.
- If using whole-grain flour, you may see faster activity in the first days; adjust to white flour over time if you want milder flavor.
- Keep the starter in a warm, consistent spot away from direct sunlight—an oven with the light on or a proofing box can help maintain 24°C (75°F).
- When discarding, save some for discard recipes like pancakes or crackers to reduce waste. Treat discard as an ingredient rather than trash.
- If your starter develops a thin dark liquid on top (hooch), stir it in or pour it off and resume feedings; hooch indicates hunger and is not dangerous.
- Label jars with date and feeding ratios so you can track age and performance, and use a clear container to monitor rise and bubbles easily.
- If you see pink, orange, or green fuzzy mold, discard the starter and clean the jar thoroughly—mold indicates contamination and is unsafe to salvage.
- A foul smell like rotten cheese or sewage that doesn’t improve after feeding signals a problem; discard and restart rather than risk using contaminated culture.
- Avoid metal bowls or spoons for long contact with starter; use plastic, wooden, or silicone utensils to prevent any off reactions, though brief contact with stainless steel is usually fine.
- Don’t leave starter unattended at very warm temperatures (above 30°C/86°F) for extended periods, as this can encourage undesirable bacterial growth and overly acidic conditions.
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