There is something quietly revolutionary about sourdough. It requires no supermarket yeast, no additives, no special equipment beyond a jar, some flour, and water. It connects you directly to one of the oldest human food traditions — bread that cultures have made for thousands of years by capturing wild yeasts from the air. And practically speaking, it produces better bread than almost anything you can buy. Here is the complete beginner’s guide to starting your own sourdough starter.
What You Actually Need
The barrier to starting sourdough is entirely psychological. You need: a clean glass jar (at least 500ml capacity), a rubber band or piece of tape to mark the level of your starter, plain flour (wholewheat or rye for the first week — the higher bran content feeds wild yeasts more effectively), water, a kitchen scale, and a warm spot in your kitchen.
You do not need: a specific brand of flour, filtered or bottled water (tap water works fine — let it sit for 30 minutes to off-gas the chlorine), a fancy starter jar, or starter from someone else’s culture. You are capturing wild yeasts from your environment. Every starter is ultimately local.
Day by Day: Creating Your Starter
Day 1: Combine 50g wholemeal flour with 50g water (room temperature) in your clean jar. Stir vigorously for 2 minutes — you want to incorporate air. Mark the level with your rubber band. Cover loosely (a cloth held by an elastic band, or a jar lid rested on top without sealing — the culture needs air). Leave in a warm spot, ideally 22-25°C.
Day 2: You probably won’t see much happening yet. Some small bubbles are a positive sign. Discard half the starter (this is important — without discarding, you’d quickly accumulate vast quantities and the acidity would prevent fermentation). Add 50g flour and 50g water. Stir, mark, cover.
Days 3-4: Activity should be becoming visible — bubbles throughout the mixture, a more pronounced sour smell, and ideally some rise and fall between feedings. The smell at this stage is often quite unpleasant (think sweaty socks) — this is normal. Acidic bacteria that produce less pleasant byproducts are outcompeted as the culture matures.
Days 5-7: Your starter should now be rising reliably between feedings, doubling in size within 4-8 hours of being fed, and smelling pleasantly tangy rather than unpleasant. When it passes the float test — a small spoonful dropped in a glass of water should float — it’s active enough to bake with.
Troubleshooting Common Problems
Liquid on top (hooch): This is alcohol produced by the starter when it’s hungry. It’s harmless. Stir it back in or pour it off, and feed more frequently.
Pink or orange streaks: Discard the starter and start again. These colours indicate harmful bacterial contamination.
No activity after a week: Try a warmer spot, switch to a higher-bran flour, or try using a tablespoon of apple juice in your water (the acidity encourages the right bacteria). Be patient — some starters take two weeks to become reliably active.
Maintaining a Healthy Starter Long-Term
Once established, your starter can live in the fridge and be fed weekly — a routine that requires about 5 minutes per week. Take it out, discard all but 50g, feed it 100g flour and 100g water, leave it out until active, then return to the fridge. When you want to bake, take it out the night before, feed it, and use it at peak activity (when it has risen and just begun to fall).
A well-maintained starter can last indefinitely. Some bakers use starters that are decades old. Yours begins a tradition that could outlast your kitchen.
A passionate advocate for sustainable, beautiful homemaking. Writing about eco-conscious living, natural design, and the small changes that make a big difference.