How to Activate a Dehydrated Sourdough Starter
A dehydrated sourdough starter is a brilliant, low-fuss way to begin baking. It's a real, mature starter that's simply been dried into flakes, ready to wake up whenever you are. Reactivating it takes a few days of simple feeding, and after that you'll have a living culture you can bake with for years. Here's exactly how to do it.
What a dried starter actually is
When you dry a sourdough starter, the wild yeast and bacteria become dormant rather than dead. Add water and flour back, and within a few days they wake up, multiply and return to full strength. It's the same culture a baker has nurtured, just paused for travel and storage, which is why it's far more reliable than trying to catch wild yeast from scratch.
Our dried sourdough starter comes in wholemeal and gluten-free rice flour options, and is beginner-friendly to activate.
What you'll need
- Your dried starter flakes
- Flour (ideally the same type as your starter, or a good unbleached bread flour)
- Filtered or non-chlorinated water at room temperature
- A clean jar and a non-metal spoon
Day by day: bringing it to life
- Day 1. Place the dried flakes in a jar with a few tablespoons of warm water and stir to dissolve. Once softened, mix in equal parts flour and water to form a thick paste. Cover loosely and leave somewhere warm.
- Days 2 to 4. Once a day, discard about half the starter and feed it again with equal parts flour and water. This regular feeding builds up the population of yeast and bacteria.
- Watch for life. Somewhere around day 2 to 4 you'll start to see bubbles, smell a pleasant tangy aroma, and notice the starter rising and falling between feeds. That's exactly what you want.
How to know it's ready to bake
Your starter is ready when it reliably doubles in size within four to eight hours of feeding, looks bubbly and domed, and smells pleasantly sour rather than sharp. A classic test is the float test: drop a small spoonful into water, and if it floats, it's full of gas and ready to leaven a loaf.
Troubleshooting a slow starter
- No activity yet? Be patient and keep feeding. Cool kitchens slow things down, so find a warmer spot, around 24 to 27C is ideal.
- A layer of dark liquid on top? That's called hooch and just means it's hungry. Pour it off and feed.
- Strong acetone or nail-polish smell? Usually a sign it needs more frequent feeding. Don't give up, it almost always comes good.
Keeping your starter going
Once active, you can keep your starter on the bench with daily feeds if you bake often, or store it in the fridge and feed it once a week if you bake occasionally. From here, you're ready to shape and prove your first loaf. A banneton will help it hold a beautiful shape, and a flour broom makes dusting it easy.
The short version
- Dissolve the flakes, then feed equal parts flour and water once a day.
- Expect bubbles and a tangy smell within 2 to 4 days.
- It's ready when it doubles within 4 to 8 hours and passes the float test.
- Keep warm, be patient, and feed regularly if it's sluggish.
In under a week you'll go from a packet of flakes to a bubbling starter and your first homemade loaf.
