What does it mean by "feeding a sourdough starter"

Feeding a sourdough starter simply means giving your living culture fresh food (flour and water ) so it stays active and strong. A starter is made up of wild yeast and bacteria, and over time they consume the natural sugars in the flour. When you feed it, you add fresh flour and water to replenish those nutrients, allowing the microbes to keep fermenting, producing bubbles, and rising. Without regular feeding, the starter becomes weak, overly acidic, or inactive. With consistent feeding of good quality flour and water, it becomes a healthy, active sourdough starter ready to bake great sourdough bread.

Why Feeding Your Sourdough Starter Matters

A sourdough starter is a living culture of wild yeast and bacteria. To keep it strong, active, and ready for baking, regular feeding is essential.

Almost always, poor feeding or maintenance of sourdough starters results in the following: 

• flat or dense sourdough bread
• a weak or runny sourdough starter
• inconsistent fermentation

Whether you’ve made your own homemade sourdough starter, purchased a sourdough starter kit, or are working with a dehydrated sourdough starter, the principles are the same.

The Basic Feeding Ratio (Simple + Reliable)

For most home bakers in NZ:

👉 1:1:1 ratio (starter : flour : water)

Example:

• 50g starter
• 50g flour
• 50g water

Or

1:2:2 ratio (starter : flour : water)

Example:

• 30g starter
• 60g flour
• 60g water

These are the easiest methods for:

• beginner sourdough
• easy sourdough starter maintenance
• consistent baking results

Note: when feeding your sourdough starter a higher ration (1:2:2), it will take longer to rise, and peak for longer before dropping back down. This gives you a wider window period to use the starter, but the trade off is that it takes longer to peak. 

Best Flour for Feeding a Sourdough Starter

Choosing the right flour makes a huge difference. At the very least we recommend feeding your sourdough starter with stoneground organic flour, even if you bake with conventional supermarket flour. 

Whole Wheat Flour for Sourdough Starter

• High in nutrients
• Boosts activity
• Great for reviving weak starters
• But does require more hydration

Rye Flour Sourdough Starter

• Extremely active
• Ideal for strengthening a sluggish starter
• Perfect for rye sourdough bread

White Bread Flour for Sourdough Starter

• Produces stable, predictable results
• Best for regular feeding and baking
• Often easiest to work with for beginners. 

Many bakers use a mix of flours for particular outcomes. 

How Often Should You Feed Your Starter?

The frequency of feeding your sourdough starter is based on the temperautre it is left at. The warmer it is the faster it will ferment, run out of food and require refeeding. 

If kept at room temperature you will need to feed it at least once a day. This is best for frequent baking.

If you are going to bake every so often, it is best to store your starter in the fridge for up to a week. When stored in the fridge you will need to feed it at least once a week. Storing your starter in your fridge is best suited for busy lifestyles and once your starter is mature and established. 

Feeding sourdough starter from fridge:

1. Remove from fridge
2. Let it warm up
3. Feed normally
4. Return after activity

How to Store a Sourdough Starter

Short-term (daily use)

• Keep at room temperature
• Feed regularly

Long-term (low maintenance)

• Store in fridge
• Feed weekly

Signs of a Healthy, Active Starter

A good sourdough starter should:

• Double in size after feeding
• Have a slightly sour, pleasant smell
• Show bubbles throughout

Common Problems (and How to Fix Them)

Runny sourdough starter

Cause:

• too much water

Fix:
Increase flour ratio

Moldy sourdough starter

Cause:

• contamination
• poor feeding

Fix:
Discard and restart

Weak or inactive starter

Cause:

• underfeeding
• infrequent feeding
• poor flour quality
• poor water qaulity
• very cool temperatures

Fix:

• Feed more frequently
• Use good organic flour
• Add rye flour or wholewheat flour for a little sourdough starter boost

Sour dark liquid on top known as hooch

Cause:

• hungry starter
  

Fix:
Stir in or pour off the liquid
Feed immediately and frequently (twice daily to increase starter strength)

Maintaining a Strong Sourdough Starter Long-Term

To build a strong sourdough starter, consistency is key:

• Feed on a schedule
• Use quality flour
• Keep temperature stable

 

When is Your Starter Ready to Bake?

Your starter is ready when:

• It doubles within 4–6 hours at approx 23 degrees Celsius (depending on temperature it may take longer in cooler environments) 
  
• Smells fresh and slightly tangy

A good bubbly sourdough starter is the core foundation to a great sourdough loaf.