Refreshing (Feeding) Your Sourdough Starter — Practical Guide

How to refresh (feed) a sourdough starter for reliable activity: why it matters, exact feeding ratios, temperature effects and troubleshooting.

Why This Technique?

Refreshing feeds the yeast and bacteria, balances acidity and ensures predictable rise for levains and doughs.

Regular refreshment (feeding) replaces spent food, lowers acid concentration and provides new carbohydrates so yeast reproduce and produce CO2 predictably. A consistent feeding routine makes starter behavior reproducible across different temperatures and flours [1][2][1].

✓ Reliable rise time when building levain or mixing dough ✓ Healthier microbial balance (less acidity, more yeast activity) ✓ Easier troubleshooting — predictable smell, texture and timing

When to Use

✓ Suitable for:

  • • Before making levain for a bake (feed until active peak)
  • • After long storage in the fridge (feed once to reactivate)
  • • When starter shows very sour smell or dark liquid on top (hooch)

✗ Not suitable for:

  • • If you need a very slow, highly acidic starter → Frequent feeding reduces acidity and speeds yeast activity
  • • If starter is moldy (colored, fuzzy) → Discard and restart — feeding won't fix mold

Step by Step

Preparation:

Weigh everything on a [digital kitchen scale](https://amzn.to/4pUMVHi). Use water at or near your target fermentation temperature (e.g., 24°C/75°F for room-temperature feeding) [1][2].

1

Discard or use a portion of starter to reach desired ratio. Typical discard keeps the working volume manageable and refreshes microbial balance.

2

Mix refreshed starter by weight: for example 1:2:2 (starter:water:flour) or 1:5:5 depending on speed required.

3

Stir vigorously until homogenous using a jar spatula. Close the jar loosely to allow gas to escape but limit contamination.

4

Mark the jar with a rubber band or tape to measure rise and place in a stable-temperature spot.

5

Use the starter at its peak (maximum rise and domed surface) for best leavening power, or refrigerate after peak to slow activity for later use.

🎬 Video Tutorial

How to Feed Your Sourdough Starter — Practical Demo 📺 Sourdough Basics ⏱️ 6:10

Step-by-step feeding demonstration and troubleshooting tips.

Common Mistakes

❌ Feeding without measuring

Problem: Unpredictable activity and inconsistent levain timing

Solution: Weigh with a [digital kitchen scale](https://amzn.to/4pUMVHi) and record ratios and times

❌ Using too-cold or too-hot water

Problem: Delays or kills microbial activity

Solution: Aim for water near desired ambient temperature; check with an [instant-read thermometer](https://amzn.to/49Xsgwp) if uncertain

❌ Feeding moldy or contaminated starter

Problem: Mold can't be salvaged by feeding

Solution: Discard and restart with clean culture; keep containers and tools clean

❌ Assuming float test always indicates readiness

Problem: Float can fail with different hydration or bubble distribution

Solution: Use rise time, doming and bubble structure as primary indicators [1][2]

Alternative Techniques

Stiff starter (low hydration)

If you want slower activity and less acidity

Refrigerated maintenance with weekly feeds

If you bake infrequently; reactivate with two feeds before baking

Sources

  1. [1]
    The Perfect Loaf – The Perfect Loaf – Link
  2. [2]
    Plötzblog – Plötzblog – Link