Starter Guide
Sourdough Starter: From Feeding to Baking Readiness
In short: A sourdough starter is flour and water maintained through regular feeding so an active community of yeasts and bacteria can ferment dough. It is ready when it rises predictably after feeding, shows bubbles throughout, smells clean and can raise dough. The float test alone is not definitive.
A sourdough starter is a living community of yeasts and bacteria in flour and water. Its value is not determined by age or bubbles alone, but by predictable rise, clean aroma, consistent feeding response and the ability to ferment dough.
What Is a Starter Made From?
The basic ingredients are flour and water, but the microbial community is shaped by flour type, extraction rate, water, temperature, hydration, feeding ratio and refresh frequency.
Whole-grain or rye flour may encourage visible activity, while a stable starter can also be maintained with white flour. There is no single mandatory flour for every starter.
How Is Sourdough Starter Fed?
A measured portion of starter is mixed with fresh flour and water. Feeding supplies new nutrients and helps manage acidity, rather than simply increasing volume.
Ratios are normally read by weight as starter, water and flour. The right ratio depends on room temperature, the time until use and starter strength.
1:1:1
A smaller refresh that may peak relatively quickly under moderate conditions.
1:2:2
Provides more fresh food and generally extends the time before peak.
1:5:5
May suit a longer interval or warmer conditions, but is not a universal rule.
When Is Starter Ready to Bake With?
Readiness should be based on a pattern across several feedings, not a single early rise. A new starter may show temporary activity before it becomes stable. The time required for maturity varies with flour, temperature and feeding routine.
- A predictable rise after feeding.
- Bubbles throughout the mixture.
- A clean, mildly acidic or fruity aroma.
- A clear peak followed by gradual decline.
- The ability to raise test dough.
Is the Float Test Necessary?
The float test is only a supporting observation. A hydrated active starter may sink, and a gas-filled sample may float even when the culture is not stable.
Use rise pattern, aroma, timing, texture and dough performance together.
Room-Temperature and Refrigerated Starter
A starter used frequently can remain at room temperature with a feeding schedule suited to the climate. Warm conditions accelerate fermentation and may require a larger feed or different timing.
For less frequent baking, refrigeration slows activity. The starter may need one or more refreshes before use to return to predictable strength.
Starter, Discard and Levain
Maintained Starter
The small culture kept and refreshed as the base of the system.
Discard
A portion removed during maintenance. It may be used in suitable recipes when it is in good condition, but it is not necessarily at peak activity.
Levain
A build made from starter for a specific dough, using a planned ratio and timing.
Common Starter Problems
Starter Is Not Rising
Review temperature, feeding ratio, flour, water and starter age. Cold conditions and immaturity are common causes.
Strong Acetone or Alcohol Smell
This may indicate hunger or long intervals between feedings.
Watery or Separated Starter
It may have passed peak activity or have high hydration. Observe the rise pattern before changing everything.
Pink, Orange or Moldy Starter
Unusual colour or visible mould suggests contamination. Discard it rather than attempting recovery.
Keeping a Small Starter to Reduce Waste
A large jar is not necessary. Maintain a small amount and build the quantity needed before baking. This reduces flour use and makes rise easier to observe.
Accurate weighing and a reasonably consistent routine help keep the system understandable.
Frequently Asked Questions
Frequently asked questions
How often should starter be fed?
It depends on temperature, feeding ratio and whether it is kept at room temperature or refrigerated. Watch its peak rather than following one schedule for everyone.
What is the best flour for starter?
Several flours work. Whole-grain or rye may support activity, while white flour can maintain a stable starter with a suitable routine.
Does starter age prove quality?
No. Current activity, stability and maintenance matter more than age.
When should starter be used after feeding?
Often near peak activity, depending on the formula, temperature and feeding ratio.
Can starter be refrigerated?
Yes. It may need refreshment before baking.
Why does starter rise and then fall?
After the culture reaches peak activity and food becomes limited, gas escapes and the structure weakens, causing the level to decline.