Feeding Your Sourdough Starter — Practical Guide

How to feed and maintain a healthy sourdough starter: ratios, schedules, troubleshooting and science-based explanations for consistent performance.

Why This Technique?

Regular feeding supplies fresh food and water to yeasts and bacteria, controls acidity, and keeps the starter predictably active.

Feeding replaces depleted sugars and reduces the concentration of organic acids produced during fermentation. That balance of pH, available carbohydrates and microbial population determines rise time, flavor and stability of the starter. Regular refreshment also prevents exhaustion or excessive acidity which slows yeast activity [1][2].

When to Use

✓ Suitable for:

  • • Before a bake when you need a predictably active starter (feed and use at peak)
  • • Daily if kept at room temperature
  • • Weekly refreshes if refrigerated

✗ Not suitable for:

  • • Using a starter straight from the fridge without refresh → May be slow and underpowered; refresh for best oven spring
  • • Feeding too frequently at high ratios → Wasteful and can destabilize microbial balance

Step by Step

Preparation:

Use a clean jar such as a [glass jar for starter](https://amzn.to/4pWAN8D) or a [clear straight-sided container](https://amzn.to/3LROhV5) so you can see rise. Have a [jar spatula](https://amzn.to/3ND05v5) or spoon ready.

1

Discard part of the starter so you work with a manageable quantity (keeping ~20–50 g of starter is typical).

👀 A reduced volume in the jar ready for refresh
2

Weigh the remaining starter and calculate feed by ratio (e.g., if you have 20 g starter and use 1:2:2, add 40 g flour and 40 g water).

👀 Ingredients on the kitchen scale
3

Mix thoroughly until no large dry pockets remain; use a jar spatula or dough whisk for efficiency.

👀 Smooth, homogenous batter-like starter
4

Mark the level on the jar with a rubber band or marker and leave at room temperature or return to the fridge depending on your schedule.

👀 Marked jar showing expected rise
5

Use at peak activity (height doubled, domed surface, many bubbles) for best leavening power; otherwise, refrigerate and refresh 24–48 hours before bake.

👀 Visible domed, bubbly starter

🎬 Video Tutorial

How to Feed a Sourdough Starter — Practical Guide 📺 Sourdough Basics ⏱️ 6:12

Short, practical demonstration of feeding and maintaining a sourdough starter.

Alternative Techniques

Refreshing with whole grain flour

Use 10–20% rye or whole wheat in a feed to boost activity quickly

Storing in the fridge with larger feeds

If you bake infrequently, use 1:4:4 and weekly refresh

Using a proofing box to control temperature

When you need predictable, accelerated activity

Sources

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