What Is Sourdough Discard and What Can You Do With It?

Every time you feed your sourdough starter, you remove a portion of it before adding fresh flour and water. That removed portion is called discard. The name makes it sound like waste, but it's actually one of the most useful ingredients in a baker's kitchen.

Why Do You Produce Discard?

When you feed a starter, you're adding fresh food (flour and water) to a small amount of existing culture. If you fed the entire starter every time without removing any, the quantity would double at every feeding — and within a few days you'd have kilograms of starter. Discarding most of it before feeding keeps the quantity manageable and maintains the correct ratio of food to culture.

The portion you remove is the "old" starter — flour that's been fermented, slightly acidic, and teeming with yeast and bacteria that have partially run out of food. It's perfectly safe and full of flavour.

What Does Discard Taste and Smell Like?

Discard tastes and smells sour — more so the longer it's been since the last feeding. Fresh discard (removed at feeding time from an active starter) is mildly tangy. Discard that's been sitting in the fridge for a week or two is sharper and more acidic. Both are useful, but they behave slightly differently in recipes.

How to Store Discard

Accumulate discard in a dedicated jar in the fridge. It will keep for up to 2–4 weeks refrigerated. You don't need to be precise — just scrape each feeding's discard into the jar and keep topping it up until you have enough for a recipe. It will continue to ferment slowly in the fridge, becoming more sour over time.

Don't let discard sit at room temperature for more than 1–2 days unless you're planning to use it immediately — it will over-ferment and become unpleasantly sharp.

What Can You Make With Sourdough Discard?

Discard works in any recipe where you want a mild tang and don't need the starter to act as a leavening agent (since unfed discard doesn't have the same leavening power as an active, fed starter). It's typically used alongside baking powder or baking soda, which provide the lift.

The best discard recipes from our blog:

• Easy Sourdough Discard Crackers — thin, crisp, and addictive. The simplest recipe in our collection.
• Sourdough Pancakes — fluffy and mildly tangy. Ready in under 15 minutes.
• Sourdough Banana Bread — richer and more tender than standard versions.
• Sourdough Crumpets — bubbly, chewy, perfect for toasting.
• Sourdough Waffles — crisp outside, fluffy inside, far better than any box mix.

Can You Use Discard Instead of Active Starter in Bread Recipes?

For most bread recipes, no — you need an active, recently fed starter at or near peak to leaven bread properly. Discard doesn't have enough active yeast and bacteria to reliably rise a loaf of bread without additional help. However, you can use discard in enriched dough recipes (like our Sourdough Cinnamon Rolls) if you supplement with a small amount of commercial yeast, though this is a different style of baking.

What If You Have More Discard Than You Can Use?

Compost it, or freeze it. Frozen discard keeps for up to 6 months — thaw in the fridge overnight before using. If you find you're accumulating more discard than you can bake with, consider reducing the quantity of starter you maintain — keep just 50–75g in the jar rather than 150g+.

For a starter to begin producing discard, browse our sourdough starter kits. See our Sourdough Education blog for more beginner guides.