Keeping a Smaller Sourdough Starter to Reduce Waste

I’ve maintained the same sourdough starter for years, refreshing it with 20g ripe starter, 100g flour (usually a mix of 50% white flour and 50% whole rye or 50% freshly milled whole wheat), and 100g water1 twice a day, every day. And while this maintenance routine means I have a strong and lively starter with enough to fuel my larger bakes here at home, keeping a smaller sourdough starter to reduce waste can make sense for those baking in smaller quantities or in times of conservation. And this smaller sourdough starter doesn’t imply it’s any less vigorous or powerful, it’s simply just scaled-down and uses only one flour variety: all-purpose white flour.

Before we begin, I’m assuming you already have a strong sourdough starter that’s ripening properly each day. If you don’t have one, head over to my guide to creating a sourdough starter from scratch to get this going first.

This post is full of sourdough starter maintenance advice and I try to keep it practical and approachable. If you need more help with creating, maintaining, or you find yourself scratching your head, my sourdough starter frequently asked questions post is replete with information. Or, check out my list of the top 21 sourdough starter problems (with solutions).

Let’s first look at what container I like to use to keep this mini-starter alive and healthy.

The best jar to hold a sourdough starter

Finding the right container to hold this small starter had me turn to my favorite jar: Weck. If you’re a regular reader here, you’ll find them scattered on just about every page, and for good reason. They make jars of all sizes and even some much smaller than the 1/2 liter or 3/4 liter I use for my usual starter.

The Weck 900 Tall Mold Jar – 1/5 Liter jars are perfect for holding this small starter. You can see above how much smaller these jars are smaller than my usual 3/4 liter jars holding my bigger sourdough starter. Inside the jar on the left, you’ll see the small amount of ripe starter I use to keep my culture going—just 5g (more on this below).

I like these jars because they have relatively straight sides, few nooks and crannies for the dough to get stuck into, and the glass lid can rest lightly on top without sealing clamps. Resting the lid in this way lets any gasses escape but keeps unwanted air and other debris from falling inside the jar. Additionally, they’re incredibly strong and easy to clean in the dishwasher.

Read more about why I think Weck jars are the best jars for a sourdough starter →

Smaller Sourdough Starter Refreshment Recipe

I’ve been testing various quantities for this for a while, and the following smaller sourdough starter has been my preferred ratio of ingredients. To scale down your current starter find a small vessel and add the following to it:

I keep this smaller starter on my counter at room temperature, around 70-72°F (21-22°C), and it ripens—meaning, it needs another refreshment of fresh flour and water—in about 12 hours.

Smaller Sourdough Starter Ripening

The following images show the progress of my smaller sourdough starter over the course of 12 hours (my normal refreshment interval) at about 72°F (22°C). Click on the gallery to see larger images.

Beginning: At the far left you see the beginning 5g of ripe starter, 25g flour, and 25g water mixed together—there’s not a lot in the jar! But as you see it progress through the day there’s plenty of activity with sensorial cues for when it’s ready to be used and when it needs a refreshment.

Just Before Peak Ripeness: In the third image from the left my starter is at, or very close to, its peak readiness. This was taken around 10 hours after feeding. This peak is when the starter has ample yeast and bacteria growth and is my preferred time to use some of the starter to create a levain or mix it straight into a dough (like focaccia).

Ready for Refreshment: In the last image, the starter has begun to smell very sour, has a very loose consistency, and has started to breakdown further. If you were to stir it, you’d feel the loose consistency and see signs of significant aeration. If you still wanted to bake with your starter at this point it’s still very possible, but know your result might be a bit more on the sour side, and you might see increased fermentation activity.

The time it takes for your starter to go from just-refreshed to very ripe will vary with the flour used, temperature, and other conditions—adjust as necessary. If it’s ripening too fast, reduce the 5g left in the jar to even less. Conversely, if it’s taking much longer than 12 hours, leave more than 5g until it ripens right when you want it.

Stretching the Refreshment Interval Even Longer

Reducing a starter down quite low helps conserve flour and reduce waste, but using 100% all-purpose flour also helps reduce activity and keep that lengthy interval. If you’re looking to stretch things even farther, reduce the amount of ripe starter left in the jar at each refreshment, all the way down to 1-2g if necessary. If you find your starter is still ripening too fast, keep it in a cooler spot in your kitchen to reduce activity further.

Scaling up: Preparing for Baking

Due to the small quantity of this starter, if the recipe you’re going to bake requires more starter to create a levain or mix directly into a dough, you’ll have to scale up your starter to cover the requirement. Many of the recipes here at my site require very little starter because I typically create a levain (which essentially scales up the pre-ferment, see more on what a levain is here). But in the case where you need a large pre-ferment, let’s look at an example to see how this is done.

Let’s say you wanted to make my sourdough fougasse, which calls for 173g of ripe sourdough starter. When your smaller sourdough starter is ripe it will produce about 55g of starter. You need to scale up your starter at the next refreshment to cover, let’s say, 190g (this way you have a little leftover starter to keep in the jar to keep your culture going with a little buffer).

Add the following to your starter jar (making sure it will hold 190g without overflowing!):

The above will yield around 187g of ripe starter after 12 hours kept at room temperature.

The key is to keep the same ratio of ingredients in baker’s percentages: 20% starter, 100% water, and as always, 100% flour. In this way, you should expect the same level of activity, time to ripe, and signs for when it’s ready (assuming you’re using the same flour and it’s kept at the same temperature as before), all the while attempting to keep the same balance of bacteria and wild yeast.

Why Not Use the Refrigerator?

A refrigerator is a great tool for slowing your starter’s activity, and it’s sometimes an approach I’ll take for a week or less, but I don’t like to keep my starter in the fridge longer than a week if I’m not traveling. When I take my starter out of the fridge, it takes a day or two to get back up to full strength, and generally, the health of my starter starts to suffer if left unattended for more than a week.

When I turn to the fridge, I use my weekend baking schedule to keep feedings to a minimum during the week, but then take it out a few days before baking to ramp it back up and prepare for baking.

The benefit of maintaining a smaller sourdough starter is the discard at each refreshment is minimal, and my starter is ready—and at full strength—to make bread every day.

Why Maintain a Larger Starter?

So with all this, why would one ever maintain a larger sourdough starter instead of just keeping a smaller one to reduce waste?

Over the years, I’ve found keeping around 200g of starter ready to go at any time ideal for the amount of baking I do here at home. In addition, I regularly make sourdough pancakes, sourdough waffles (see the next section), and even a sourdough galette from time-to-time. Having that excess starter almost always gets used in some way, and if it doesn’t directly go into a baked good, the excess sourdough starter goes in my compost pile.

My typical feeding schedule means my starter is at full power and ready to go when I need it for the amount of baking I typically do—but sometimes scaling things back to “maintenance mode” is the right option to ensure I can still bake but in a reduced capacity.

What to do With Starter Discard?

Maintaining this small sourdough starter means much less discard than maintaining a larger starter, but there will always be some discard. One approach is to save up all this discard in one container in the fridge in what I like to call a sourdough starter cache. Then, use all this at once in a starter discard recipe or my sourdough waffles, pancakes, or banana bread at the end of the week.

What’s Next?

If you haven’t tried my simple weekday sourdough bread that’s the next place to turn; with this starter, you can make two loaves of sourdough during the busy work week without having to scale up the starter refreshments. This smaller sourdough starter maintenance routine and that weekday recipe are an effective team: minimal waste, minimal fuss, and healthy sourdough bread any day of the week.

Happy baking!

If you try this smaller sourdough starter, I’d love to see how you use it! Tag @maurizio on Instagram and hashtag your photo #theperfectloaf so I can take a look.