Keeping a Smaller Sourdough Starter to Reduce Waste

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I’ve maintained the same sourdough starter for years, refreshing it with 20g mature 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 maturing 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.

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

The Vessel

Finding the right container to hold this small amount of starter had me turn to my favorite jars: 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 that are much smaller than the 1/2 liter or 3/4 liter I use for my usual starter.

Smaller weck jar for sourdough starter
Small 1/5 liter Weck jar vs. larger 3/4 Liter jar

I found the Weck 900 Tall Mold Jar – 1/5 Liter jars are just perfect to hold this small starter. You can see above how much smaller these jars are compared to my usual 3/4 liter jars holding my bigger sourdough starter. Inside the jar on the left, you’ll see the small amount of mature 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 the need for the 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.

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 just find a small vessel and add the following to it:

WeightIngredientBaker’s Percentage
5gMature sourdough starter20%
25gWater100%
25gAll-purpose white flour100%

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

Smaller Sourdough Starter Maturity

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 mature 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.

 Be flexible:  adjust the amount of ripe starter carried over to lengthen or shorten the refreshment interval (time between refreshments).

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 matures right when you want it.

Stretching the Refreshment Interval Even Longer

Reducing the quantities of 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, just reduce the amount of mature starter left in the jar at each refreshment, all the way down to 1-2g if necessary. If you find your starter is still maturing too fast, keep it in a cooler spot in your kitchen to reduce activity further.

Scaling up a small sourdough starter

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 mature sourdough starter. When your smaller sourdough starter is mature 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!):

WeightIngredientBaker’s Percentage
17gMature sourdough starter (carryover)20%
85gWater100%
85gAll-purpose white flour100%

The above will yield around 187g of mature 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 maturity, 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. I find 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.

Maintaining a small sourdough starter out of the fridge means  less discard  and a  strong starter  that’s ready to bake with everyday.

When I do 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 as outlined in this post 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?

Sourdough waffles

Maintaining this small sourdough starter means much less discard than when you maintain a larger starter, but there will always be some discard. One approach is to save up all of this discard in one container in the fridge. Then, use all this discard at once in 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.


  1. The amount of mature starter carried over fluctuates based on the season.

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