There is a moment almost every new sourdough baker remembers.

You mix flour and water, put the jar on the bench… and then what?

For the next few days, you check it, sniff it, watch for bubbles and wonder whether you’ve done something wrong.

You probably haven’t.

A sourdough starter is a living culture of wild yeasts and bacteria, and getting to know how it behaves is part of learning to bake sourdough.

These are 10 of the most common sourdough starter questions we hear from home bakers — and the practical answers we’d give you.

1. What Exactly Is a Sourdough Starter?

A sourdough starter is essentially flour and water fermented by naturally occurring yeasts and bacteria.

These microorganisms feed on nutrients in the flour and produce gases and organic acids during fermentation.

The gas helps your bread rise, while fermentation contributes to sourdough’s distinctive flavour and aroma.

You’re not creating anything particularly complicated. You’re simply giving a natural fermentation process the right environment, regular food and enough time to establish itself.

2. How Often Should I Feed My Sourdough Starter?

It depends on your starter, your feeding ratio and, importantly, the temperature of your kitchen.

A healthy, active starter kept at room temperature may need feeding once or even twice a day, particularly in warmer conditions.

In a cooler kitchen, fermentation will generally happen more slowly.

Rather than relying entirely on the clock, learn to watch your starter.

After feeding, it should begin bubbling and rising. Eventually it will reach its peak and then start to fall.

Once you’ve looked after the same starter for a while, you’ll begin to recognise its rhythm.

3. What Is the Best Flour for a Sourdough Starter?

The good news is that you don’t need a special “starter flour”.

A quality bread flour, wholemeal flour or rye flour can all be used to establish and maintain a sourdough starter.

Wholegrain and rye flours are particularly popular when establishing a new starter because they contain more of the grain and can encourage fermentation activity.

Once your starter is established, you can continue feeding it with wholegrain flour or transition to a good-quality white bread flour for a more predictable routine.

At Basic Ingredients, we’re big believers in choosing flour according to what you’re trying to bake rather than assuming one flour is perfect for everything.

4. Why Does My Sourdough Starter Smell Strange?

Sourdough starters develop a surprisingly wide range of aromas.

Depending on its age, temperature and feeding cycle, your starter might smell:

• Fruity
• Yeasty
• Tangy
• Yoghurt-like
• Vinegary
• Slightly alcoholic
• Occasionally similar to acetone or nail polish remover when very hungry

A strong acidic or acetone-like smell can be a sign that your starter needs feeding.

However, there is an important distinction between a hungry starter and a contaminated starter.

If you see visible mould or unusual pink or orange discoloration, don’t simply feed it and hope for the best. Discard it, thoroughly clean your equipment and start again.

5. Why Is There Liquid on Top of My Sourdough Starter?

You may occasionally find a layer of liquid sitting on top of a neglected or hungry starter.

This is commonly referred to as “hooch” and can contain alcohol produced during fermentation.

It’s usually a sign that your starter has been sitting for some time and needs fresh food.

You can pour the liquid off or stir it back through before feeding. Stirring it through may contribute to a more acidic flavour.

Then give your starter a proper feed and allow it to become active again.

6. Why Is My Sourdough Starter Not Rising?

Don’t panic.

A sourdough starter that’s not rising isn’t necessarily dead.

New starters can go through periods where they appear extremely active followed by several surprisingly quiet days. This can be part of the normal process of establishing a stable culture.

Temperature can also make an enormous difference.

A starter sitting in a cold kitchen will generally ferment much more slowly than one kept somewhere comfortably warm.

Give it fresh flour and water, keep it at a suitable temperature and give it time.

If you’re consistently seeing no activity, review your feeding ratio, flour, water and temperature before giving up.

7. How Do I Know When My Sourdough Starter Is Ready to Bake With?

This is one of the biggest questions for new sourdough bakers.

A mature starter should rise predictably after feeding and show plenty of fermentation activity.

Look for:

• Consistent rising after feeds
• Plenty of bubbles throughout the starter
• A pleasant fermented aroma
• A predictable rise and fall cycle

You’ve probably heard about the sourdough float test: dropping a spoonful of starter into water and seeing whether it floats.

It’s a handy observation, but don’t rely on it as your only test.

A starter can be perfectly capable of making bread and still fail the float test. Consistent fermentation and predictable rising are much better indicators of starter strength.

8. Can I Keep My Sourdough Starter in the Fridge?

Absolutely.

For home bakers who aren’t making sourdough every day, refrigeration makes maintaining a starter much easier.

The cold dramatically slows fermentation, which means you don’t have to maintain the same feeding routine as a starter kept permanently at room temperature.

Many bakers feed a refrigerated starter approximately once a week, although the ideal schedule can vary.

When you’re planning to bake, remove your starter from the fridge and give it time to become active again. Depending on its condition, one or more room-temperature feeds may be helpful before mixing your dough.

9. Do I Really Have to Discard Sourdough Starter?

Discarding isn’t simply about throwing flour away.

If you continually add flour and water without removing any starter, your jar will quickly become enormous and you’ll need increasingly large quantities of flour to maintain an appropriate feeding ratio.

Removing some starter keeps the quantity manageable and makes feeding easier.

Better still, sourdough discard doesn’t necessarily have to go in the bin.

Try using it in:

• Pancakes
• Waffles
• Crackers
• Flatbreads
• Muffins
• Pizza dough
• Cakes and other baked goods

Just remember that discard isn’t necessarily being used for its leavening power in these recipes.

Don’t throw your discard away! Try our 7 Easy Sourdough Discard Recipes for pancakes, crackers, pizza, flatbreads, muffins, waffles and savoury scones.

10. Why Does My Sourdough Starter Keep Failing?

If your sourdough starter isn’t behaving as expected, don’t immediately blame yourself — or the flour.

Work through the basics systematically.

Check:

Temperature: Is your kitchen particularly cold or excessively hot?

Feeding ratio: Are you giving the culture enough fresh flour and water?

Timing: Are you feeding before the starter has had enough time to ferment?

Flour: Are you using fresh, good-quality flour?

Water: If your water is heavily treated, trying filtered water may be worthwhile.

Consistency: Are you changing flour, feeding ratios and temperatures constantly?

Sourdough rewards consistency.

Change one thing at a time, observe what happens and learn how your particular starter behaves.

And if you genuinely need to start again?

That’s okay too.

Every starter teaches you something.

The Honest Bottom Line

Sourdough doesn’t need to be as complicated as the internet sometimes makes it sound.

Flour. Water. Fermentation. Time.

Learn when your starter is hungry. Keep it at a sensible temperature. Feed it consistently. And don’t panic every time it behaves a little differently.

Most importantly, remember that sourdough isn’t about producing an Instagram-perfect loaf every time. It’s about understanding your ingredients and learning how fermentation behaves in your own kitchen.

And good bread always starts with good ingredients.

Want to Skip Making a Starter From Scratch?

If you’d rather get straight into baking, Basic Ingredients gives away sourdough starter FREE — you only pay the postage.

It’s an easy way to get your sourdough journey started without spending days trying to establish a new starter from scratch.

Once it arrives, feed it, get it active and you’re ready to start learning the wonderfully addictive world of sourdough baking.

🥖 FREE Sourdough Starter — Just Pay Postage

Available from BasicIngredients.com.au for home bakers across Australia.

Then all you need is good flour, water, salt… and a little patience.

Get your FREE Sourdough Starter from Basic Ingredients and start baking.