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An established sourdough starter does not need to occupy a large jar or dictate every evening. A useful routine separates maintenance from baking: keep a modest reserve, feed it on a predictable schedule, and build the amount a recipe needs shortly before mixing dough. This approach applies to a mature, reliably active starter, not one still being created.

Keep a small, measurable reserve

Use a clean, straight-sided jar with room for expansion. Mark the level after feeding with a rubber band or washable marker. A loose-fitting lid protects the starter from debris while allowing gas to escape; fabric can dry the surface and is not necessary.

For a 100%-hydration starter, flour and water are equal by weight. One example feeding is 15 grams of starter, 30 grams of water, and 30 grams of flour. That is a 1:2:2 feeding ratio and produces 75 grams total.

The ratio describes starter, water, and flour in that order. It is not a required jar size or a guaranteed timetable. Keep using the same flour and ratio while learning the starter's pattern so changes are easier to interpret.

At the next maintenance feeding, retain only the seed amount again: weigh 15 grams into a clean jar, then add the fresh water and flour. Use the healthy remainder for a baking build or discard recipe, or discard it. Feeding the entire accumulated jar would quickly defeat the small-reserve approach.

Use refrigeration between baking days

For occasional baking, refrigeration slows the feeding cycle. A weekly feeding is a common maintenance starting point for a mature starter; daily room-temperature maintenance generally requires more frequent attention. King Arthur's maintenance guide outlines both approaches.

After feeding a healthy reserve, allow fermentation to begin before returning it to the refrigerator according to your maintenance method. Label the jar with the feeding date. Store it where the temperature is steady rather than repeatedly leaving it on the counter during meal preparation.

Cold storage does not stop fermentation completely. The starter may rise and fall between visits, and a long-neglected jar may need several refreshments before it is strong enough for bread. Do not schedule an important loaf around an unverified assumption that one feeding will revive it.

Build only what the recipe needs

Suppose your dough requires 100 grams of ripe starter. In a separate jar, combine 20 grams of healthy 100%-hydration starter with 50 grams of water and 50 grams of flour. This makes 120 grams, leaving a small margin for starter clinging to the jar and spoon.

Keep the maintenance reserve separate so you cannot accidentally use every gram in the bread. Feed that reserve as needed and return it to storage. The baking build can stay out until it reaches the activity the recipe requires.

A larger proportion of fresh flour relative to seed starter generally extends the time to maturity under otherwise similar conditions. Temperature also matters. Rather than promising an overnight result, observe one build on a day when you can check it periodically.

Learn the rise pattern

A ready build should show substantial expansion and bubbles throughout, not merely a few bubbles on top. Its surface may dome and then start to level near peak activity. A streak higher on the jar reveals that it has already risen and fallen.

Use the rise pattern together with aroma and consistency. A pleasantly tangy smell is normal, but smell alone does not demonstrate leavening strength. The float test is also unreliable as a sole decision tool because handling and hydration affect buoyancy.

Record the feeding time, ratio, room temperature, and approximate peak. Those four details make future scheduling easier. If it peaks while you are asleep, adjust the next build's timing or ratio rather than trying to force every starter into the same clock schedule.

Handle delays and warning signs

If plans change before mixing dough, refrigerate a healthy build and refresh it when you are ready to resume. An overripe build is not automatically ruined, but it may behave differently from the lively starter the bread formula expects.

A grayish liquid layer or sharp alcoholic aroma can indicate hunger, but neither observation overrides signs of contamination. Discard the entire starter if you see fuzzy mold, pink or orange discoloration, or detect a putrid smell, consistent with King Arthur's starter-safety FAQ. Do not scrape off a suspicious surface and keep the rest.

Avoid creating a large discard supply in the first place. Save discard only from a healthy, established starter, keep it refrigerated, and use it in recipes that cook it thoroughly. Raw starter contains uncooked flour and is not a tasting sample.