How to Revive a Dehydrated Sourdough Starter

A dehydrated sourdough starter looks like nothing. A few flakes of dried paste in a bag. It seems impossible that something alive could survive in that state — but it does, sometimes for years, and reviving it is simpler than most people think.

Our starter "Brocis" ships dehydrated because it travels safely without refrigeration and has a much longer shelf life than a live jar. This guide walks you through exactly how to bring it back to full strength.

What You'll Need

Keep it simple. You need the dehydrated starter, unbleached all-purpose or bread flour, non-chlorinated water (filtered or left out overnight), and a clean jar. That's it. No special equipment.

Chlorine in tap water can slow or kill the wild yeast. If you're on city water, either use a filter or fill a glass and let it sit uncovered for an hour before using it.

Day 1 — The First Feeding

Add 1–2 tablespoons of the dried flakes to your jar. Pour in 2 tablespoons of lukewarm water and stir until the flakes dissolve as much as possible. Add 2 tablespoons of flour and mix well. Cover loosely — a loose lid, a cloth, or plastic wrap with a pinhole — and leave at room temperature.

Don't expect anything dramatic on day one. The cultures are waking up. You might see a few small bubbles by evening. You might see nothing. Both are normal.

Days 2–3 — Building Strength

Once a day, discard all but about a tablespoon of the mixture and feed with equal parts flour and water (by weight is most accurate, but volume works fine for beginners). By day two you should see bubbling. By day three, a healthy starter will visibly rise and fall between feedings.

If it's slow, move it somewhere warmer. Starter is happiest between 70–78°F. On top of the refrigerator, near a warm oven, or in an oven with just the light on are all good spots.

How to Know It's Ready to Bake With

The float test is the classic check: drop a small spoonful of starter into a glass of water. If it floats, it's full of gas bubbles and ready to leaven bread. If it sinks, give it another day.

A reliable starter will double in size within 4–8 hours of feeding, smell pleasantly sour and yeasty (not like nail polish remover), and have a domed top at its peak. Most rehydrated starters hit this point within 4–5 days.

Common Problems and Fixes

Pink or orange streaks: Discard everything and start over. This is contamination, not normal.

Liquid on top (hooch): It smells like alcohol because the starter is hungry. Pour it off or stir it in, then feed more frequently.

Not rising after 5+ days: Try switching to whole wheat or rye flour for one feeding — the extra wild yeast in whole grain flour often jumpstarts a sluggish culture.

Smells like cheese: Normal. Some starters go through a funky phase early on. Keep feeding and it'll mellow out.