A sluggish starter feels alarming when you're new to sourdough — but nearly every "my starter is dead" panic is fixable in a day or two. This quick-fix guide walks through the twelve most common symptoms, what they actually mean, and exactly what to do about each. Bookmark it — nine out of ten problems land somewhere on this list.
The One Rule Before You Panic
Starters look worrying long before they're actually in trouble. The only real death signs are pink, orange or red streaks, or fuzzy mould (fluffy white, green or black). Everything else — no rise, no bubbles, sharp smell, grey liquid, collapse — is fixable with food and warmth. Read that again before you throw a starter out.
Work through the symptoms below and most starters come back. If yours does not — or you would rather not spend another fortnight coaxing it — beginning again with a live culture that is active in two hours is a perfectly reasonable shortcut.
Symptom 1: "It's Not Rising At All"
Nine times out of ten, temperature. Wild yeast is most active at 24–26°C. Below 22°C it slows dramatically, below 18°C it barely moves. Move the jar somewhere warmer — near (not on) the oven, inside a turned-off oven with the light on, or in an airing cupboard. Give it 6–12 hours, then check again.
If it's warm and still not rising, feed 1:1:1 (equal weights starter, flour, water) once or twice a day for 2–3 days. Persistence almost always brings it back.
Symptom 2: "A Few Bubbles But No Real Rise"
You have activity but not enough yeast population. Almost always means too cool or too infrequently fed. Feed a bigger ratio — 1:2:2 or 1:3:3 instead of 1:1:1 — and keep it at 25°C for 24–48 hours. The bubbles will multiply into a proper rise.
Symptom 3: "It Doubled Yesterday, Nothing Today"
The starter peaked, ran out of food, and collapsed while you were sleeping. It's not sick — you just missed the peak. Either feed at a bigger ratio so it takes longer to peak (and stays there), or set an alarm and catch it 4–8 hours after feeding.
Symptom 4: "Grey or Brown Liquid on Top"
That's hooch — harmless alcohol produced when the starter has eaten all its food. It means the starter is hungry, not dying. Stir it back in for a slightly tangier flavour, or pour it off. Then feed as normal.
If the layer of hooch is very deep or has been sitting for days, discard down to a tablespoon before feeding — the acid levels can suppress fresh yeast activity.
Symptom 5: "Smells Like Nail Polish Remover / Acetone / Sharp Vinegar"
Extreme over-hunger. The starter has fermented everything and swung heavily acidic. Feed it more often (every 12 hours instead of every 24) or with a bigger ratio (1:5:5). The acetone smell should mellow to a pleasant tang within 2–3 feeds.
Symptom 6: "Smells Sweet, Doughy, and Won't Rise"
Usually underfed and too cool. The yeast can't get going. Feed generously (at least 1:1:1, ideally 1:2:2), and move somewhere warm. Sweet-smelling flat starters are common in cold flats through UK winter.
Symptom 7: "Rises Then Collapses in Two Hours"
Perfectly healthy — it just peaked fast. Either use it as soon as it hits the top of its rise, or feed a bigger ratio so it takes longer to peak. A fast, aggressive rise is a sign of a strong starter, not a weak one.
Symptom 8: "Runny Like Pancake Batter"
Cosmetic issue, not a health one. Hydration is preference — most bakers keep starters at 100% (equal weights flour and water), but 60% to 125% all work. If you'd prefer thicker, add a little less water at the next feed. If you like runny, you're already there.
Symptom 9: "Very Thick, Almost Dough-Like"
Same as symptom 8 in reverse. Add a little more water at the next feed. Thick starters ferment more slowly but produce sharper flavour — some bakers actively prefer 50–60% hydration for that reason.
Symptom 10: "Bubbles But No Rise (Yet Passes Float Test)"
The starter is producing gas — the bubbles are trapping it — but the jar shape doesn't let it dome. Try transferring to a taller, narrower jar (a Kilner-style tall jar is ideal). Same starter, same feed, but the rise will suddenly look dramatic.
Symptom 11: "Forgot To Feed for Weeks/Months"
Don't panic — starters are far tougher than they look. As long as there's no mould and no pink streaks, it's almost certainly revivable. Discard down to a tablespoon, feed 1:1:1, and repeat once or twice a day. Within 2–3 days it should be bubbling and doubling again. Older/drier starters may need 3–5 days to fully wake — persistence wins.
Symptom 12: "Pink, Orange, or Fuzzy Mould"
The one time you actually give up. Pink, orange or red streaks mean unwanted bacteria have taken over. Fuzzy mould (fluffy white, green, black) means the same. Throw the starter out, wash the jar thoroughly, and start fresh. Do not try to save part of it — the contamination goes throughout.
Note: hooch (grey/brown liquid) is not mould. Neither is a sharp sour smell. Only pink, orange, red or fuzzy growth qualifies as a real death sign.
The Quick-Fix Cheatsheet Table
| Symptom | Fix |
|---|---|
| Not rising at all | Move somewhere warmer (24–26°C), feed 1:1:1 |
| Few bubbles, no rise | Bigger ratio (1:2:2), keep warm 24–48h |
| Doubled yesterday, nothing today | You missed the peak — feed bigger ratio |
| Grey liquid on top | Hooch — stir in or pour off, feed as normal |
| Acetone/nail-polish smell | Feed more often, or 1:5:5 ratio |
| Sweet, doughy, flat | Underfed + cold — feed 1:2:2, keep warm |
| Rises then collapses fast | Healthy — use sooner or feed bigger ratio |
| Runny/thick consistency | Cosmetic — adjust water at next feed |
| Bubbly but no dome | Try a taller, narrower jar |
| Forgotten for weeks/months | Discard to 1 tbsp, feed 1:1:1 twice a day for 3 days |
| Pink/orange/fuzzy mould | Bin it — the only real death sign |
FAQ
How long can a sourdough starter go without feeding?
In the fridge, 2–4 weeks between feeds is fine. Some bakers stretch it to 6–8 weeks with a stiffer starter. At room temperature, aim for every 12–24 hours to keep it at peak. Longer gaps are recoverable — see symptom 11 above.
Why isn't my brand new starter bubbling on day 1?
Because that's normal. A brand new starter (built from flour and water) takes 5–14 days to establish a stable culture. Days 1–3 may look completely inert, days 4–7 you'll see a flurry of activity that then dies back, and only around day 10–14 does it stabilise into a reliable, doubling-in-4-hours starter. If you don't want to wait, a dehydrated ready-made starter revives in 2 hours instead.
Can I use tap water to feed my starter?
Yes, but chlorine in fresh tap water can slow or damage the yeast. Leave a jug of tap water uncovered for a few hours (chlorine dissipates), or use a filter. Never use very hot water — anything over 40°C starts to kill the culture.
What flour is best for feeding a starter?
Strong white bread flour is the most reliable everyday feed. Wholemeal or rye kickstarts a sluggish starter faster because the bran carries more wild yeast — many bakers keep a small "boost" bag of rye specifically for revival feeds.
Is a slow starter really dead or just slow?
Almost certainly just slow. Real starter death is rare and looks very specific (pink/orange streaks or fuzzy mould). Slow, sluggish, sleepy, sour or flat behaviour is fixable in 1–3 days of consistent feeding and warmth.
Skip the Rescue Missions
If you'd rather not deal with reviving anything, a ready-to-bake culture avoids the whole cycle. The Dough Dough Fast Start Sourdough Starter is shelf-stable, lab-verified to contain Lactobacillus sanfranciscensis, and activates in 2 hours — no 7-day build-up. Whenever you're ready, it's ready.
Related reading: The full Sourdough Starter Troubleshooting hub · What is Lactobacillus sanfranciscensis?
