Sourdough bread for beginners (and less waste)

Sourdough bread is leavened by wild yeast and bacteria that you cultivate yourself in a simple mixture of flour and water — a starter. Once you have an active starter, the process is straightforward, though it takes time and a little attention to get right. This guide covers everything from creating a starter from scratch to baking, troubleshooting and storing your loaf.

Why bake your own sourdough?

There are several good reasons to bake your own bread, and they stack up well together. First, packaging: a loaf of bread from a shop comes wrapped in plastic. Home-baked bread needs none, and the ingredients — flour and salt — are available in paper bags or bulk bins. That's a meaningful reduction in single-use plastic over time, especially if bread is a daily staple.

Second, cost. Flour is one of the cheapest food staples available, and a home-baked loaf costs a fraction of an equivalent artisan sourdough from a bakery. The more you bake, the better the value.

Third, satisfaction. There's something genuinely enjoyable about the process — the smell of an active starter, the texture of well-developed dough, the sound of a crust cooling on a wire rack. Baking bread is one of those skills that gets better with practice, and the learning is part of the pleasure.

Finally, simplicity. A basic sourdough uses flour, water, salt and the wild yeast and bacteria you cultivate yourself. No additives, no emulsifiers, no ingredients you can't name. For many people that's part of the appeal, though it's worth noting that commercial bread isn't inherently problematic — this is about preference and sustainability, not fear of shop-bought bread.

Making and maintaining a starter

A sourdough starter is a living culture of wild yeast and lactic acid bacteria maintained in a mixture of flour and water. It's what makes bread rise and gives sourdough its characteristic flavour. Building a starter from scratch takes around five to ten days; after that, it can last indefinitely with regular feeding.

Creating a starter from scratch

Mix equal weights of flour and water — 50 g of each is a manageable amount — in a clean glass jar. Stir thoroughly, cover loosely (a cloth, a loosely placed lid, or a jar lid set on top without tightening) and leave at room temperature. Feed it every 24 hours: discard roughly half, then add fresh flour and water in the same ratio.

For the first few days, it may look inactive. By day three or four, you'll usually see bubbles forming. By day five to ten, the starter should reliably rise and fall after feeding — rising to a peak and then subsiding. When it does this predictably and smells pleasantly tangy or yeasty (not unpleasant), it's ready to bake with.

Wholemeal flour tends to establish faster than white flour because it contains more wild yeast and bacteria. Using a combination of wholemeal and white works well for both speed and flavour.

Maintaining an established starter

Once your starter is active and you're baking regularly (a few times a week), you can keep it on the counter and feed it once or twice a day. If you bake less often, store it in the fridge and feed it once a week. To use a refrigerated starter, take it out, feed it, let it come to room temperature and reach peak activity, then use it in your dough.

A healthy active starter smells tangy, yeasty or slightly alcoholic — all normal. A liquid layer (called "hooch") forming on top means it's hungry; pour it off or stir it back in and feed more frequently. If the starter smells clearly rotten or shows coloured mould (pink, orange, green), discard it and start again with a clean jar.

What to do with discard

Every time you feed a starter you remove some of the existing mixture — this is discard. Throwing it away is a small but real waste: it's perfectly edible and usable in many recipes. Managing discard is one of the ways sourdough baking connects to broader food-waste reduction (see our guide to reducing food waste).

Discard has a mild sour flavour and can replace some of the flour and liquid in recipes where that doesn't affect the result. It works well in:

• Pancakes and waffles — replace some of the flour and milk; the result is light and slightly tangy
• Flatbreads and crackers — discard makes excellent thin crackers with olive oil and sea salt
• Pizza dough — add discard along with a small amount of commercial yeast for a quicker, flavourful dough
• Quick breads and muffins — where baking powder or soda does the leavening, discard adds flavour and reduces waste
• Waffles — the most popular discard use: mix with egg, butter and a little sugar for crisp, tangy waffles

Store discard in a separate jar in the fridge — it keeps for a week or more. Many bakers accumulate a week's worth and use it in a batch cook of pancakes at the weekend.

The basic loaf process

Sourdough baking looks complicated in detailed recipes, but the underlying process is simple: mix, wait, fold, shape, wait, bake. Here's a plain overview of each stage.

1. Prepare your starter (levain). Take your starter out of the fridge the night before or morning of baking. Feed it and let it rise to peak activity — bubbly, domed, roughly doubled. This is when it's most powerful for leavening bread. Time your bake around this peak.
2. Mix the dough. Combine the active starter with water and mix well, then add flour and salt. Stir or mix until no dry flour remains. Leave the mixture to rest, covered, for 30–60 minutes. This rest (called autolyse) lets the flour hydrate fully and starts gluten development without any kneading.
3. Stretch and fold (bulk fermentation). Over the next 4–6 hours at room temperature, perform stretch-and-fold sets to build dough strength. Grab one side of the dough, stretch it upward and fold it over the top. Rotate the bowl and repeat from all four sides. Do one set every 30–45 minutes for the first couple of hours, then leave the dough undisturbed to finish bulk fermentation. The dough should feel airier, smoother and more elastic by the end.
4. Shape. Gently turn the dough onto an unfloured surface. Using a bench scraper or your hands, shape it into a tight round or oval, working the surface tension as you go. A good shape holds its form and doesn't spread sideways.
5. Prove (final rise). Place the shaped dough seam-side up into a well-floured banneton (proofing basket) or a bowl lined with a well-floured cloth. For a cold prove: cover and refrigerate overnight (8–16 hours). For a room-temperature prove: cover and leave 1–3 hours. Cold proving is generally more beginner-friendly — the dough is firmer when cold, making scoring easier, and the flavour is usually better.
6. Bake. Preheat your oven with a lidded Dutch oven (cast-iron pot with lid) inside at 230–250°C (450–480°F) for at least 45 minutes. Turn the cold dough directly onto baking paper. Score the top with a sharp knife or bread lame. Lower it into the hot pot using the baking paper as a sling, put the lid on, and bake for 20 minutes. Remove the lid and bake a further 20–25 minutes until deep golden-brown. Cool on a wire rack for at least one hour before cutting — the interior is still setting as it cools.

Equipment: what you need vs nice-to-have

What you actually need

• A glass or ceramic jar for the starter
• Kitchen scales — baking by weight is far more reliable than volume
• A large mixing bowl
• A lidded Dutch oven or cast-iron casserole — this is the one piece of kit worth investing in if you don't have it; it traps steam in the first phase of baking, which is essential for a good crust
• A sharp knife for scoring the dough before baking
• A wire cooling rack

Useful but not essential

• A banneton (proofing basket) — a bowl lined with a floured cloth works almost as well
• A bench scraper — helpful for shaping; a spatula does a reasonable job
• A bread lame (scoring tool) — a sharp craft knife or razor blade is a good substitute
• A dough thermometer — helpful for tracking fermentation, but not required to start

Energy-smart baking

An oven is one of the higher-energy appliances in a kitchen, so it's worth baking efficiently when you do use it. Sourdough lends itself well to this because it stores and freezes so well. Bake two loaves at once whenever your schedule allows — the extra energy needed to bake a second loaf is minimal compared to baking two separate times. See our sustainable pantry guide for more on building an efficient kitchen routine.

Cold proving (overnight in the fridge) means you can bake early in the morning when energy demand on the grid may be lower, and fit baking into a natural gap in the day rather than being tied to the kitchen for the whole bulk fermentation period.

Troubleshooting common problems

Dense or gummy crumb

The most likely cause is an under-active starter that couldn't generate enough gas, or under-fermentation — the dough didn't have enough time to develop. Make sure your starter is reliably rising and falling after feeding before you bake with it. If bulk fermentation was cut short due to time, the crumb will be dense. Also check that the dough was cooled fully before cutting — slicing too soon compresses the crumb and makes it seem gummy.

Flat loaf that spreads sideways

Usually over-proofing: the dough fermented past its peak and the gas structure collapsed before baking. If your shaped loaf looks almost flat when you take it out of the fridge, it may have been left too long. Shaping technique also matters — a loose, poorly tensioned shape won't hold its form during baking.

Starter not rising after feeding

A new starter may need more time — up to ten days in a cold kitchen. Make sure you're using unchlorinated water (leave tap water to stand for a few minutes or use filtered water). Try a higher proportion of wholemeal flour to introduce more wild yeast. Warmer temperatures speed up activity, so keeping the jar somewhere consistently warm (above 20°C / 68°F) helps during establishment.

Very sour flavour

Longer, cooler fermentation produces more acetic acid (sharp, vinegary) and shorter, warmer fermentation produces more lactic acid (milder, yoghurt-like sourness). If your bread is sharper than you'd like, try a slightly warmer bulk ferment or a shorter cold prove.

Storing and freezing sourdough

Sourdough keeps better than most commercial bread because the organic acids produced during fermentation act as natural preservatives. Once the loaf is fully cooled, store it cut-side down on a clean board or in a cloth bag or paper bag. Avoid airtight plastic bags for short-term storage — they trap moisture and soften the crust; the fridge also accelerates staling, so keep bread at room temperature. A well-made sourdough typically stays good for three to five days.

For longer storage, freeze in thick slices as soon as the loaf has cooled. Frozen slices can be toasted directly from frozen — no need to thaw first. A whole loaf can also be frozen once cooled, then thawed at room temperature and refreshed in a hot oven for 10–15 minutes. This is a good approach when baking two loaves at once: eat one fresh, freeze the other.

• Wait for a reliably active starter before attempting your first loaf.
• Use kitchen scales — consistent results depend on accurate weights.
• Don't rush bulk fermentation: an under-fermented dough makes a dense loaf.
• Cold prove overnight to improve flavour and make scoring easier.
• Save discard in the fridge for pancakes, crackers or flatbreads.
• Bake two loaves at once and freeze one for later.
• Cool the loaf fully before cutting — at least an hour.