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How to make Sourdough Starter

A two-week wild yeast cultivation project. Daily feedings build a reliable, active levain ready for baking.

Quick answer

Combine flour and water in a clean jar, mark the level, and leave for wild microbes to colonize. After 2 days, check for first signs of life, then discard most of the starter and feed with fresh flour and water. After 5 days, continue once-daily feedings and track the rise-and-fall cycle until activity becomes consistent and predictable. After 7 days, confirm the starter is bake-ready using the float test and consistent doubling, then set your maintenance routine.

Difficulty
Intermediate
Total time
7 days
Ingredients
3
Steps
4

Safety

  • • Never use an airtight lid. The culture produces gas and benefits from a little oxygen exchange.
  • • Pink, orange, or fuzzy growth is not normal. Discard the starter and start over if you see it.
  • • A dark liquid layer can happen when the starter is hungry. That is a feeding issue, not automatically a safety failure.

Step-by-step

Day 0

Step 1: Mix the Initial Starter

Combine flour and water in a clean jar, mark the level, and leave for wild microbes to colonize.

  • Combine Flour and Water Mix 50 g of whole wheat flour with 50 ml of unchlorinated room-temperature water in a clean jar.
  • Mark and Rest Place a rubber band at the batter level, cover loosely, and leave at 21-24C.
Day 2

Step 2: First Feeding

Check for first signs of life, then discard most of the starter and feed with fresh flour and water.

  • Check for Signs of Life Look for small bubbles on the surface or sides of the jar, and possibly a slight rise above the rubber band.
  • Discard and Feed Discard all but 50 g of the starter, then add 50 g flour and 50 ml water. Stir thoroughly.
  • Re-mark and Observe Move the rubber band to the new level and check over the next 12-24 hours for a noticeable rise.
Day 5

Step 3: Daily Feeding Rhythm

Continue once-daily feedings and track the rise-and-fall cycle until activity becomes consistent and predictable.

  • Feed at the Same Time Each Day Discard to 50 g, add 50 g flour and 50 ml water, stir, mark the level, and repeat at the same time tomorrow.
  • Track the Rise Pattern A healthy starter will double in size within 4-8 hours of feeding. Note when it peaks and when it falls.
  • Assess the Aroma Daily A healthy starter smells pleasantly sour, fruity, or yeasty. Note any changes.
Day 7

Step 4: Readiness and Maintenance

Confirm the starter is bake-ready using the float test and consistent doubling, then set your maintenance routine.

  • Try the Float Test At peak activity, drop a teaspoon of starter into water -- if it floats, the culture is leavening-ready.
  • Verify Consistent Doubling Feed in the morning and confirm the starter reliably doubles before midday -- 4-8 hours peak = bake-ready.
  • Set Your Maintenance Schedule Choose counter storage (daily feedings) or fridge storage (weekly feedings) based on your baking frequency.

What to look for

  • • Day 2-3: You start seeing scattered bubbles and maybe a slight rise above the marker. Early activity can be inconsistent, so do not judge maturity too quickly.
  • • Days 5-10: The starter rises after feeding and develops a rounded dome before falling back. This shows the yeast and bacteria are beginning to work in a repeatable rhythm.
  • • Mature starter: It doubles within 4-8 hours after feeding and smells clean, fruity, or gently tangy. That is a better readiness signal than the float test alone.

Troubleshooting

  • There are almost no bubbles after several days. The room is cool or the flour is low in microbial activity. Move the jar somewhere warmer and include some whole grain flour in the next few feedings.
  • A dark liquid layer forms on top. The starter is underfed and has run out of food. Pour off the liquid if needed and resume regular feedings on schedule.
  • The starter bubbles but never doubles. It is still immature or staying too cool between feedings. Keep feeding consistently for a few more days and aim for a warmer environment.
  • Colored spots or fuzzy mold appear. Contamination took hold. Discard the culture, clean the jar thoroughly, and restart.

Storage

Once mature, keep it on the counter with daily feedings or in the fridge with weekly feedings. Drying a backup is useful insurance.

Shelf life: indefinitely with regular feedings

Serving suggestions

  • • Use it to build bread dough with a stronger rise and better flavor.
  • • Stir discard into pancakes, waffles, crackers, or flatbreads.
  • • Keep a dry backup so you can recover quickly if the jar is lost.

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Frequently asked questions

What is Sourdough Starter?

A two-week wild yeast cultivation project. Daily feedings build a reliable, active levain ready for baking.

How long does it take to make Sourdough Starter?

Most batches of Sourdough Starter are ready in about 7 days, though exact timing depends on temperature and how the ferment tastes along the way.

Is Sourdough Starter hard to make?

Sourdough Starter is an intermediate project — straightforward for home fermenters with a bit of experience.

What do you need to make Sourdough Starter?

You'll need Whole wheat flour, All-purpose flour, Unchlorinated water.

How do I know when Sourdough Starter is ready?

Watch for these cues: Day 2-3: You start seeing scattered bubbles and maybe a slight rise above the marker.; Days 5-10: The starter rises after feeding and develops a rounded dome before falling back.; Mature starter: It doubles within 4-8 hours after feeding and smells clean, fruity, or gently tangy..

How do I store Sourdough Starter?

Once mature, keep it on the counter with daily feedings or in the fridge with weekly feedings. Drying a backup is useful insurance. Shelf life: indefinitely with regular feedings.

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