The Ultimate Guide to Capturing Your Own Wild Yeast
A patient, seven-day method for building a lively sourdough starter from nothing more than flour and water.
By Amanda Kelly
Every great loaf begins in a jar. Before you shape a boule or score an ear, you're a cultivator — a keeper of a small, hungry ecosystem of wild yeast and lactic bacteria. The starter is the soul of sourdough, and it costs almost nothing to grow.
The premise is simple: flour and water, left in the open, will attract the wild microbes already present in your kitchen and on the grain itself. With regular feedings, those microbes multiply into a stable colony strong enough to leaven bread.
Below is the exact schedule we use in our own kitchens. It errs on the side of patience — a slow, cool ferment produces better flavor than a hurried, warm one — and it works even if your kitchen sits below 68°F.
Frequently Asked Questions
How do I know my starter is ready to bake with?
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It should predictably double in size within 4 to 6 hours of feeding, smell yeasty and mildly tangy, and pass the float test in cool water.
What flour should I use for feedings?
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A 50/50 blend of whole wheat and unbleached bread flour builds fastest. Once established, most bakers maintain with plain bread flour.
Can I use tap water?
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If your tap water is heavily chlorinated, leave it uncovered for a few hours or use filtered water — chlorine slows fermentation.
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