Building a Sourdough Starter from Scratch
You are not just mixing flour and water; you are cultivating a local environment for yeast to thrive. Patience is your primary ingredient, as the starter will go through a period of activity before turning quiet and then finally becoming robust.
Consistency creates the culture
Use filtered or non-chlorinated water, as chlorine can inhibit the growth of the yeast you are trying to capture. Keep your jar in a draft-free spot, preferably near 70-75°F.
- Glass quart jar
- Digital kitchen scale
- Wooden spoon or silicone spatula
What goes in.
- 100gWhole wheat flour or rye flour (for the first 3 days)
- 100gUnbleached all-purpose flour (for daily maintenance)
- 100gFiltered water, room temperature
Maintaining Balance
Discarding half the starter before feeding is essential to prevent your jar from overflowing and to ensure the new flour is fully consumed by the existing yeast population.
The method.
Day 1: Initial mix
Combine 50g of whole wheat flour and 50g of water in your jar. Stir until no dry flour remains. Cover loosely and leave for 24 hours.
Day 2-3: First signs
Add 50g of whole wheat flour and 50g of water to the existing mixture. Stir well. You may see a few small bubbles.
Day 4-7: Switching to maintenance
Discard all but 50g of the starter. Add 50g of all-purpose flour and 50g of water. Repeat this every 24 hours until the mixture reliably doubles in size within 4-6 hours of feeding.
Day 8+: Testing for readiness
When the starter peaks at double its original volume and smells distinctly tangy rather than like acetone or raw grain, it is ready to bake.
When it doesn't go to plan.
If your starter develops a dark liquid on top (hooch), it is hungry. Pour it off and feed the starter as usual.
Mark the jar with a rubber band at the level of the starter immediately after feeding to track how much it grows.
If the starter looks inactive after day five, move it to a warmer location to encourage yeast activity.
The ones that keep coming up.
Does it matter what kind of flour I use?
Whole wheat or rye flour is essential for the first few days because they contain the wild yeasts and nutrients needed to jumpstart the culture.
How do I store the starter long-term?
Once active, move it to the refrigerator. Feed it once a week to maintain health.