Why Consistency Beats Perfection

A sourdough starter is not a demanding pet, but it does reward routine. Get three things right — regular feeding, a steady temperature, and the habit of actually looking at the jar — and you will have a dependable, lively leaven on your worktop for years. Starters are far more forgiving than most books suggest. They survive holidays, heatwaves and forgotten feeds. What they do not like is chaos: a spell in the airing cupboard, then a week in the fridge, then a feed with whatever flour is nearest to hand.

The aim is not a perfect starter. The aim is a predictable one — a jar you understand well enough to know when it is ready to raise a loaf and when it needs another meal.

The Feeding Rhythm

Weigh everything. Spoons and cups give you a starter that drifts thinner or thicker with every feed, and hydrations you cannot repeat. A digital scale costs very little and removes all the guesswork.

• Everyday feeding: 50g starter, 50g flour, 50g water (a 1:1:1 ratio). It will be ready in roughly four to six hours at room temperature.
• Less frequent feeding: 20g starter, 100g flour, 100g water (1:5:5). This keeps it alive for up to 24 hours without going hungry.
• Discard first. Tip most of the starter out before you feed, keeping only the amount you need. Otherwise you will be drowning in the stuff by the weekend.
• Flour choice: strong white works perfectly well, but a spoonful of wholemeal or rye added to each feed gives the yeast far more to eat and noticeably more vigour.
• Water: lukewarm, never hot. If your tap water is heavily chlorinated, let it stand for an hour first or use filtered water.

Stir well, scrape down the sides of the jar, and cover loosely. A cloth secured with an elastic band or a lid set on askew is ideal — the starter needs to breathe, not be sealed in.

Temperature Is the Variable Nobody Talks About

Most home bakers blame their flour or their technique when a starter misbehaves. More often it is simply too cold or too warm. The sweet spot is 20–24°C. Below 18°C everything slows to a crawl; above 28°C the starter turns sharp and sour as it races through its food.

Find one spot in the kitchen and keep the jar there. A north-facing windowsill in January, a boiler cupboard, or the top of the fridge are all classic mistakes. If your kitchen is cold, stand the jar in a bowl of tepid water, or use slightly warmer water when feeding. If it is hot, move it somewhere shaded and feed it more often, as it will be burning through its flour quickly.

Time how long your starter takes to double. In a warm kitchen, four hours. In a cool one, ten. That single number is more useful than any recipe instruction, because it tells you when to bake.

Reading Your Starter: Bubbles, Smell and Rise

Your eyes and nose are better instruments than any timer.

• Bubbles: a healthy starter looks lacy and alive, with a fine network through the whole jar rather than a few holes on top.
• Smell: at its peak it smells of yoghurt, ripe fruit or flat beer — pleasant and slightly tangy. A nail-varnish or acetone smell means it is starving. A paint-thinner smell means it has got too warm.
• Rise: put an elastic band around the jar at the level of the freshly fed starter. It should at least double, often triple, and crown into a dome before it sinks back.

The moment just before it collapses is peak. That is when to mix your dough, or to feed again if you are not baking. A starter left past its peak is still usable, but it will be acidic and sluggish.

Keeping It Alive Through Busy Weeks

When life gets in the way, use the fridge. At around 4°C a starter goes into slow motion and needs feeding only once a week. Feed it, let it sit at room temperature for an hour, then chill it. The night before you plan to bake, take it out, discard and feed as usual, and let it come back to full strength.

If it has been neglected for a fortnight, do not panic. Pour off any grey liquid on top, scrape away the darkened surface layer, then feed at 1:5:5 twice a day for two or three days. It will come back.

For very long breaks, spread a thin layer of starter on baking paper, let it dry somewhere cool, crumble it into a jar and store it in a cupboard. Rehydrate with warm water and a little flour when you want it again. Throw away anything with fuzzy pink, orange or black growth — that is mould, not character.

When Things Go Wrong

• Watery with liquid on top: hungry. Feed more often or use a bigger ratio.
• No rise, thin texture: check your ratio by weight, and check the temperature.
• Sluggish for days: build it back up with two or three daily feeds of white plus a little rye.

Keep it simple, keep it steady, and keep looking at it. Your starter will tell you everything you need to know.