What You’ll Need

Ingredients

Day 1

• 60g whole wheat flour
• 60g filtered water (room temperature)

Days 2–14

• 60g bread flour or all-purpose flour
• 60g filtered water

Equipment

• Large glass jar (1-liter capacity recommended)
• Digital kitchen scale
• Spoon or spatula
• Rubber band or marker
• Loose-fitting lid

Understanding Sourdough Starter

A sourdough starter develops through natural fermentation. Wild yeast from the flour and environment colonize the mixture and work alongside beneficial bacteria.

Over time these microorganisms:

• Produce carbon dioxide for rising bread
• Create organic acids for flavor
• Strengthen dough structure
• Improve shelf life of baked goods

The process takes time because you’re building a stable microbial culture from scratch.

Day-by-Day Instructions

Day 1: Create the Starter

In a clean glass jar combine:

• 60g whole wheat flour
• 60g room-temperature filtered water

Mix thoroughly until no dry flour remains.

The mixture should resemble a thick pancake batter.

Scrape down the sides of the jar.

Cover loosely with a lid and place in a warm area between 75°F and 80°F (24°C–27°C).

Let sit undisturbed for 24 hours.

What Happens Today?

Very little may appear to happen.

Wild microorganisms are beginning to colonize the mixture even though visible activity may be minimal.

Day 2: First Feeding

After 24 hours:

1. Check for bubbles.
2. Discard about half of the mixture.
3. Add:
   • 60g flour
   • 60g water
4. Stir thoroughly.

Cover loosely and leave for another 24 hours.

What to Expect

You may notice:

• Small bubbles
• Slightly sweet smell
• Mild fermentation activity

Some starters remain quiet during this stage.

Day 3: Building Activity

Discard half again.

Feed with:

• 60g flour
• 60g water

Mix thoroughly.

Mark the level with a rubber band.

Cover loosely.

What to Expect

Many starters become very active today.

You may see:

• Numerous bubbles
• Noticeable rise
• Slightly sour aroma

Do not assume the starter is ready yet.

This early burst is often caused by temporary bacterial activity.

Day 4: The Slowdown

Repeat feeding:

• Discard half
• Add 60g flour
• Add 60g water

Mix well.

What to Expect

Many beginners worry at this stage because activity often decreases dramatically.

You may see:

• Fewer bubbles
• Little or no rise
• Less visible activity

This is normal.

The microbial population is rebalancing.

Continue feeding consistently.

Day 5: Strengthening the Culture

Continue the feeding schedule.

If your kitchen is warm and the starter is active, you may begin feeding every 12 hours.

Signs of Improvement

• More consistent bubbling
• Better aroma
• Slight growth after feeding

The starter should smell pleasantly tangy.

Day 6: Developing Strength

Feed as usual.

Observe:

• Rise after feeding
• Bubble formation
• Texture changes

The starter should begin feeling lighter and more airy.

Large and small bubbles should appear throughout.

Day 7: Testing Readiness

Feed the starter and monitor it carefully.

A mature starter should:

• Double in size within 4–8 hours
• Contain abundant bubbles
• Have a pleasant sour aroma
• Rise and fall predictably

If these signs are present, the starter may be ready.

If not, continue feeding daily.

Many starters require 10–14 days to reach full strength.

Days 8–14: Maturing the Starter

Continue feeding every 24 hours.

The starter will become:

• More predictable
• More flavorful
• Better at rising dough

A mature starter typically doubles or triples after feeding.

At this stage, it should be strong enough for artisan bread baking.

The Float Test

Although not always necessary, you can perform a float test.

1. Fill a bowl with water.
2. Drop a spoonful of starter into the water.
3. If it floats, it likely contains enough gas for baking.

Remember:

A starter may still bake excellent bread even if it fails the float test.

Growth and doubling are more reliable indicators.

Maintaining Your Starter

Daily Countertop Maintenance

For frequent bakers:

• 50g starter
• 50g water
• 50g flour

Feed every 24 hours.

Weekly Refrigerator Maintenance

For occasional bakers:

1. Feed the starter.
2. Let it sit at room temperature for 1–2 hours.
3. Refrigerate.

Feed once every 7 days.

Reviving a Refrigerated Starter

1. Remove from refrigerator.
2. Feed normally.
3. Allow to rise.
4. Feed again after 12–24 hours.

After 1–3 feedings, it should be ready for baking.

Common Problems and Solutions

Starter Isn’t Rising

Possible causes:

• Low room temperature
• Weak flour
• Chlorinated water
• Young starter

Solution:

• Move to a warmer location
• Use whole wheat flour
• Continue feeding

Gray Liquid on Top

This liquid is called hooch.

It indicates hunger.

Either:

• Stir it in
• Pour it off

Then feed immediately.

Strong Vinegar Smell

A very hungry starter may smell sharp or acidic.

Increase feeding frequency until balance returns.

Mold Growth

If you see:

• Pink spots
• Orange discoloration
• Fuzzy growth

Discard the starter immediately.

Pro Baker Tips

Use Whole Wheat Flour Initially

Whole wheat flour contains more nutrients and microorganisms, helping starters develop faster.

Keep Temperatures Stable

Consistent warmth encourages predictable fermentation.

Use a Scale

Weight measurements provide much better results than cups.

Track Growth

Use a rubber band to mark the starter level after feeding.

Be Patient

The most common mistake is giving up too early.

When Is Your Starter Truly Ready?

Your sourdough starter is considered mature when:

✅ Doubles in size within 4–6 hours

✅ Produces a pleasant tangy aroma

✅ Shows strong bubbling throughout

✅ Maintains consistent activity for several days

✅ Successfully leavens bread dough

Once your starter reaches this stage, you’ll have a powerful natural leaven capable of producing bakery-quality sourdough bread for years to come.