Stiff vs liquid sourdough starter: which one should you keep?

A liquid starter (the usual one, around 100% hydration) is fed with equal weights of flour and water, giving a thick-batter consistency. A stiff starter (often 50 to 60% hydration) gets about half the water, so it's a firm dough you could roll into a ball. Italian bakers know the stiff version as lievito madre or pasta madre. Both are the same living culture; only the water changes.

Water decides which microbes thrive. A wet, liquid starter favours the acid-producing bacteria, so it leans tangy and sharp, more of that classic sour twang. A stiff starter holds less free water, which tilts the balance toward the yeast and toward milder, sweeter, more aromatic acids. If your bread is too sour for your taste, moving toward a stiffer starter is one of the simplest levers you have.

A liquid starter is fast and reaches its peak quickly, which is great when you're attentive and bad when life gets in the way, because it also collapses and over-acidifies fast. A stiff starter ferments more slowly and holds near its peak for longer, so it's far more forgiving of an irregular schedule and tolerates the fridge beautifully. The trade-off: it's a little more effort to mix a firm dough than to stir a batter.

Keep a liquid starter if you bake often, are around to feed it, and like a pronounced sour. Keep a stiff one if you bake on an irregular schedule, want a milder loaf, or travel. Whichever you pick, the variable you most need to see is time-to-peak, and that's invisible without a record. Logging each feed in Sourdough Tracker with a rise note makes the personality of your starter legible: you learn its real peak window instead of guessing, and switching hydration becomes an experiment you can actually read the results of.

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