Rescue Your Sourdough Starter: 7 Common Problems and How to Fix Them

Before you throw that jar out, take a breath. Sourdough starters are incredibly resilient. I've revived starters that had been neglected for months in the back of the fridge. Whatever's going on with yours, there's almost certainly a fix.

1. Starter Won't Rise

The most common issue, especially for new starters. Check your temperature first. Below 20C, fermentation crawls. Move it somewhere warmer (24-27C) and switch to a feed with some rye flour — rye supercharges microbial activity. Give it 2-3 consistent feeds before worrying.

2. Starter Smells Like Nail Polish

That sharp, acetone-like smell means your starter is producing acetic acid, usually because it's hungry. Feed it immediately with a higher ratio like 1:3:3 and keep feeds regular. The smell will correct itself within a day or two.

3. Dark Liquid on Top (Hooch)

Hooch is alcohol produced by a starving starter. It's not harmful. Stir it back in for a more sour flavor, or pour it off for a milder taste, then feed normally. If you see hooch regularly, your starter needs more frequent feeds or a higher ratio.

4. Mold on the Surface

If you see pink, orange, or fuzzy spots, that's actual mold. Scrape off everything you can see plus a generous margin. Take a small amount from the center of the jar (where mold hasn't reached), transfer it to a clean jar, and feed immediately. If mold has penetrated throughout, it's time to start fresh with our starter-from-scratch guide.

5. Starter Rises Then Collapses Quickly

This actually means your starter is very active — it's just running out of food. Increase your feeding ratio to 1:2:2 or 1:3:3. The extra food gives the yeast more to work with, extending the rise and giving you a wider baking window.

6. Starter Is Very Thick or Very Thin

Consistency matters. A healthy starter at 100% hydration (equal flour and water by weight) should be like thick pancake batter. If it's too thick, your flour may be absorbing more water — add a splash more. If it's runny, reduce water slightly. Always measure by weight, not volume.

7. Starter Smells Terrible After Day 2-3

Almost every starter problem comes down to three things: temperature, feeding consistency, and flour quality. Get those three right and your starter will reward you with years of beautiful bread.

Once your starter is back on track, learn how to feed it properly so these problems don't come back. And when you're ready to bake, our first sourdough loaf recipe is waiting for you.