Is My Sourdough Starter Dead?

You open the jar, and nothing is happening.

No big bubbles. No obvious rise. Maybe there is even a layer of dark liquid sitting on top.

Before you throw it away, give it a closer look.

A quiet sourdough starter is often hungry, cold or neglected rather than dead. The first question is not whether it looks lively. It is whether there are any signs that it is unsafe to keep.

First, Check for Signs You Should Throw It Away

There are times when trying to rescue a starter is not worth the risk.

Discard it if you see:

• visible mould
• pink or orange colouring or streaks
• unusual coloured growth
• a genuinely rotten or putrid smell

Do not simply scrape mould from the top and keep what is underneath.

If none of those signs are present, the starter may still be recoverable even if it looks fairly unpleasant.

Dark Liquid on Top Does Not Usually Mean It Is Dead

A neglected starter may develop a grey, brown or almost black layer of liquid on top. This is commonly called hooch.

It usually means the starter has been sitting without fresh food for quite a while.

You can pour the liquid off or stir it back in, then keep a small amount of the starter and give it fresh flour and water.

What happens after that feeding is much more useful than how the jar looked before it.

What If It Has Been in the Fridge for Weeks?

Do not assume it is dead.

Cold temperatures slow fermentation considerably, so an old refrigerated starter may look flat, separated and almost inactive when you first take it out.

Give it a normal feed and leave it somewhere comfortably warm.

It may take more than one feeding to return to its usual behaviour, particularly if it has been neglected for a long time.

There is no need to panic if the first feed is underwhelming.

How to Tell Whether It Is Coming Back

After feeding, look for a change rather than one perfect sign.

Encouraging signs include:

• new bubbles appearing throughout the starter
• a noticeable increase in volume
• the texture becoming lighter and more aerated
• a clean sour or fermented smell

A rubber band around the jar at the level immediately after feeding makes the rise much easier to see.

Even a small increase in activity is encouraging when you are reviving a neglected starter.

A Few Bubbles Do Not Mean It Is Ready to Bake

This distinction matters.

A starter can be alive without yet being strong enough to raise a loaf well.

If your neglected starter produces a few bubbles after its first feed, that is a good start. Keep feeding it consistently and watch whether the rise becomes stronger and more predictable.

For bread baking, you want a starter that repeatedly responds well after feeding, not one that managed to produce three bubbles overnight.

What If Nothing Happens?

Give it some time before making more changes.

If your kitchen is particularly cold, move the starter somewhere comfortably warmer. Fresh flour and consistent feeding may be all it needs.

For a sluggish starter, adding some wholemeal or rye flour to a feeding can also be worth trying.

What you do not need is to change the flour, water, feeding ratio and temperature all at once. If activity returns, you will have no idea which change actually helped.

Flat Does Not Always Mean Dead

Sometimes a starter looks flat simply because you missed the rise.

Look at the inside of the jar. If there are streaks of starter higher up the glass, it may have risen earlier and already fallen again.

This is another reason a rubber band or simple marker is useful. It lets you see where the starter began, even if you were not there when it reached its highest point.

The Simple Test

If there is no mould, pink or orange growth, or genuinely rotten smell, do not throw the starter away just because it looks quiet.

Keep a small amount, give it fresh flour and water, and watch what happens over the next few feedings.

If it begins rising and bubbling predictably again, you have your answer.

It was not dead. It just needed some attention.