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Maintain Your Sourdough Starter like Never Before with the Sourdough Home
Maintaining a vigorous and healthy starter is key to achieving great results with your sourdough bread. Understanding the needs of your starter and being able to provide the right environment will have a significant impact on the final result of your baking efforts.
Sourdough starter is a fermented mixture of flour and water that hosts a complex blend of microorganisms. Wild yeast and lactic acid bacteria feed on the flour, and their by-products are what leaven and flavor bread. By refreshing a starter with flour and water regularly, the microbes can stay alive and healthy. An active, well-cared-for starter is crucial to achieving great results in sourdough baking.
In addition to a food source, microbes need the right environment to thrive. Temperature directly and profoundly impacts fermentation activity- how quickly (or slowly) your starter will ripen. Therefore, when you have the bread-making tools to control the temperature of your starter precisely, it is easier to predict and control fermentation.
The first-of-its-kind Sourdough Home allows you to maintain your sourdough starter on your schedule with degree-by-degree control over the temperature.
Find a setting that generates a feeding schedule to work with your schedule. No matter your need, you’ll have a starter that’s ready when you are.
Degree-by-degree temperature control from 5–50°C (41–122°F) makes it possible to adjust the feeding schedule of your starter from hours to days, or even once a week. This means:
Benefits of the Sourdough Home
- Less discard, less waste, and less maintenance.
- It’s easier to predict the behavior of your starter, making it easier to plan your bakes.
- More control over the aroma and flavor profile of your bread.
- New possibilities for manipulation and experimentation (such as a pasta madre) otherwise not accessible to home bakers.
To learn more about creating a starter from scratch, read our article.
The Importance of Temperature for Sourdough Starter
If you maintain a sourdough starter, you are familiar with the issues that can come with a starter's maintenance. Daily feedings can become a chore and sometimes forgotten altogether. Discard is wasted or builds up in the refrigerator. Fermentation activity can be unpredictable, especially in fluctuating temperatures. The Sourdough Home allows you to keep your starter at a constant temperature year-round, regardless of season or ambient temperature.
In addition to keeping it at one specific temperature, with the Sourdough Home, you can keep your starter at different temperatures to adjust your feeding schedule. Lower temperatures will slow fermentation, allowing you to go days between feedings.
Adjust Your Feeding Schedule
Precise control over a wide range of temperatures allows you to manage the fermentation rate of your starter and helps you control when your starter peaks. Weekend bakers may only want to feed their starter occasionally. Daily feeding is unnecessary and wastes a lot of flour. Often, bakers store their starter in the refrigerator as an alternative to feeding daily. However, refrigerator temperatures hover around 38°F (3°C), too cold for the microbes to stay active. When it comes time to bake, the starter may need multiple feedings to get it up to full strength and ready for baking. Using the Sourdough Home to store your starter is the perfect solution. By keeping your starter cool but not cold, you can slow down fermentation without bringing it to a complete halt. Your starter will stay healthy and ready to use when you're ready to bake.
We ran a side-by-side comparison of starters kept at different cool temperatures. We kept one starter in a refrigerator at 38°F (3°C), and we kept the other in the Sourdough Home set to 50°F (10°C). We wanted three days to pass without feeding our starter- a common situation if you are away for the weekend. The seed ratio, hydration level, flour type, and beginning temperature were identical for each starter. The starter kept in the Sourdough Home experienced much more fermentation activity than the one held in the refrigerator. After 72 hours at 50°F (10°C), it was fully ripe, while the refrigerator starter was sluggish and showed little signs of activity.
Next, we used a portion of each starter to seed a levain. The levains were identical other than the starter used. Once mixed, the levains were kept at the same temperature (78°F / 25°C) to ripen.
After 6 hours, the results showed a clear difference. The levain seeded with the Sourdough Home starter had considerably more fermentation activity- tripling in size by the time the other levain had barely risen.
Left: starter held in a 38°F (3°C) refrigerator for 72 hours.
Right: starter held at 50°F (10°C) in the SD Home for 72 hours.
Left: levain seeded with a starter stored in the refrigerator for 72 hours.
Right: levain seeded with a starter stored in the SD Home for 72 hours.
Both levains were left to ripen at 78°F (25°C) for 6 hours.
Feeding Schedule Guideline
With the Sourdough Home, you can create a starter feeding schedule that works for you. Feed your starter once a day, every three days, or even once a week. Time to peak at various temperatures will depend on seed ratio, hydration level, and type of flour used. Experiment with your own starter to get desired results.
Using a constant feed ratio (the amount of starter: flour: water) and continuous temperature gives you great control over when your starter peaks. We have some guidelines below based on our experiments, but your results may vary depending on your starter.
Feeding Schedule by Temperature*
| Temperature | Time to Feed | Seed Ratioᐩ |
|---|---|---|
| 7°C / 45°F | 5 Days / 120 Hours | 1:4:4 |
| 10°C / 50°F | 3 days / 72 hours | 1:4:4 |
| 12°C / 54°F | 2 days / 48 hours | 1:4:4 |
| 20°C / 68°F | 1 day / 24 hours | 1:4:4 |
*Note: Your starter may vary from these results depending on the flour used and the specifics of your culture. These guidelines are based on a 100% hydration starter fed with all-purpose flour.
ᐩSeed Ratio: This is the ratio of active culture to fresh flour and water. The more active culture used, the faster your starter grows and peaks.
Experiment with Temperature to Influence Flavor
Not only can you maintain the perfect temperature and adjust the feeding schedule, but it is possible to use temperature to adjust the flavor profile. Lactic acid bacteria (LAB) far outnumber the yeast present in sourdough (roughly 100 to 1) and play a huge role in the flavor and aroma development of sourdough bread. Bacterial populations can be influenced by temperature, flour type, and hydration level.
There are three types of LAB found in sourdough, and they are classified by how they ferment sugars and the resulting by-products produced.
- Homofermentative LAB produce lactic acid.
- Heterofermentative LAB produce lactic acid, acetic acid or ethanol, in addition to carbon dioxide.
- Facultative Heterofermentative can switch between homofermentative and heterofermentative depending on environmental conditions (can switch between pathways depending on what sugars are available).
Facultative Heterofermentative can switch between homofermentative and heterofermentative depending on environmental conditions (can switch between pathways depending on what sugars are available).
Different temperatures will favor different types of LAB, so you can adjust the temperature of your starter or levain to suit your tastes over time. In general, homofermentative LAB favors warmer temperatures, and heterofermentative LAB favors cooler temperatures. There are mixed thoughts on what “warmer” and “cooler” are exactly, but in general, 86-95°F (30-35°C) is on the warmer side, and 64-77°F (18-25°C) is cooler. However, both types can grow outside of their “ideal range.” At warmer temperatures, LAB will be more active overall, and acids will accumulate faster- which can result in a more sour loaf.
LAB is only one piece of the picture. Wild yeasts thrive around 77-86°F (25 - 30°C). Within this temperature range is when they will be the most active, multiplying and producing the byproducts that leaven bread. This process will still occur at lower temperatures (yeast is more tolerant of cooler temperatures than LAB), albeit slower.
With living things, much is conditional, and many variables will impact the outcome. It is not as simple as drawing a straight line from point “A” to point “B.” Experiment with your starter, and find what works for your schedule and what flavors suit your taste.
To learn more about other factors influencing flavor in sourdough, such as flour type and maturity level, read our article How to Make Sourdough More (or Less) Sour.
Ready When you are
Fermentation activity would be a bell curve if graphed. After feeding, the activity exponentially increases as the microorganisms feed and reproduce. Once this activity reaches a peak, there is a drop-off as the food source disappears, and the population of microorganisms begins to die off. The ideal time to feed or use a sourdough starter is when it peaks or shortly after. Doing so will ensure the yeast and bacteria populations are at their height and fermentation activity is strong. Use it too soon, and the starter will not be vigorous enough. Wait too long, the starter will become overly acidic, and the yeast population will decrease. With the Sourdough Home, you have more control over when your starter peaks, setting you up for better success when it's time to bake.
Control the Temperature. Control Your Timeline
With precision temperature control, the Sourdough Home creates an environment of your choosing, making it easy to maintain and prepare your starter for baking. You no longer need to worry about your starter (or levain) over-ripening before you are ready or being underripe when you are. Keep it in the Sourdough Home and set the desired temperature to fit your timeline.
Ready to bake? Try this Beginner Sourdough Bread recipe to get you started, learn How to Make Sourdough More (or Less) Sour, and explore our range of culinary products designed to help you achieve professional results at home.
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44 comments
Do I need to cover the starter when placed in the Sourdough Home.
Carol – Yes, we would recommend covering your starter.
Could you explain how I leave the starter in the “Home” at what temperature when I will be gone for five days and how to feed it when I need it to bake again? Do I feed it before I put it in for the “rest”? How many days before I can use my starter?
Sharon – Based on our experiments, our sourdough starter took 5 days to ripen at 45°F (7°C). That was with a seed ratio of 1:4:4 (one part starter, four parts water, and four parts flour by weight). We put freshly fed starter into the Sourdough Home set to 45°F, and 5 days later, it was fully ripe. At that point, we removed the starter and either used it for baking or gave it a refreshment before putting it back into the Home. Some people prefer to make a levain build from their starter if it has been in the Sourdough Home for multiple days without being refreshed. From our experience, this is optional as long as your starter is ripe. (We successfully used a 5-day-old starter for sourdough bread without an additional feeding.) However, if your starter seems overripe or you prefer to do so, one single feeding should be enough to ready it for baking. It will take some experimentation to determine what works best for your starter. However, once you do, you will have a new level of control over the fermentation rate, and you can utilize that to suit your baking schedule.
I just received my Sourdough Home. Using my mature 100% hydration starter I converted over to a 1:4:4. I was hoping to bake on Saturday so put my jar in the SDH at 54 for a two day fermentation. My thoughts were that I would feed the 1:4:4 on Friday, set the temp for 77 and it would be ready for use on Saturday. In reading the comment from Carol it sounds as though the 1:4:4 ratio I made today needs 5 days to ferment before I can use it? Please confirm. Thank you!
Pam – It sounds like you have the right idea. From our experience, a starter that has just been fed a 1:4:4 ratio by weight and then put into the Sourdough Home set to 54F will take two days to ripen. So, if you put your starter in the SDH today (Wednesday), it should be ready for another feeding on Friday. If you increase the temperature at that point as you plan to do, then your starter should be ready for baking on Saturday. Hope that answers your question, and please don’t hesitate to reach out with any others. Happy Baking!
I am thoroughly confused. I have a starter that is 2.5 years old. I’ve always stored it in the refrigerator and took it out once a week for a refresh (occasionally longer than a week). I always let it come to room temperature prior to feeding. My feeding has been 80 grams of water , 20 grams of current starter, 100 grams of flour. How does my newly purchased sourdough home help me? What temperature do I use between feedings? Do I have to bring it to a different temperature prior to feeding? For how long? And once fed do I immediately return the starter to the home and at what temperature?
Amy – There isn’t one best way to maintain your starter using the Sourdough Home. We designed it so that bakers can have a tool that provides them greater control over the fermentation rate of their starter. The temperature used depends on how often you want to feed your starter. You can adjust the temperature to speed up or slow down fermentation. From our experience, the refrigerator is just too cold, and the starter is better held for longer periods at a slightly warmer temperature. If you wish to continue feeding your starter once a week, you can try keeping your Sourdough Home at 43F. Your starter should still be active at this temperature and will peak, but it will occur slowly over days rather than hours (if at a warmer temperature.) There is no need to let your starter come to warm up again before feeding it. You can feed it and place it back into the Sourdough Home. It will take some experimentation to figure out what works best for you and your starter, but once you do, it will open up a whole new world of possibilities and give you much greater control over your starter. If you have further questions, please don’t hesitate to email us at contact@brodandtaylor.com We are always happy to help answer baking-related questions.
Hi I am interested in your Sourdough Home. May I know where and how I can read the manual before purchase so that I am clear about all the technical details. Thanks
Sally – you can find the instruction manual under the ‘Specifications’ drop-down menu on the Sourdough Home product page here! https://brodandtaylor.com/products/sourdough-home
Hi. I just received the sourdough home as a birthday present. I love it! My question is, I am going out of town for 11 days, how do I maintain my starter in the sourdough home for longer periods of time. Should I drop the temperature, and increase the feeding ratio? Thank you.
Patti- Yes, we’d recommend doing those two things. 1) Set the Sourdough Home temperature to its lowest setting (5°C). This will slow down the fermentation process as much as possible 2) Use a small inoculation percentage (or seed ratio) for the last feeding before storing the starter. The larger the amount of starter used when feeding (in relation to the flour and water), the faster the freshly fed starter will ferment. Using a very small percentage will extend the time you have before the microbes exhaust their food source. Try something like 1:6:6 (1 part starter: 6 parts flour: 6 parts water- all by weight) or even 1:8:8. When you return, raise the temperature of the SD Home and give the starter a couple of feedings (with your preferred feeding ratio) before using it.
Does it have an odor. I can’t make sour dough because the odor gives my husband a headache
Pat – No, the Sourdough Home itself does not have an odor.
I just received my machine yesterday. I’m new to baking sourdough bread and I’m on the 7th day of trying to make a starter. I moved my starter that has been at room temp for the first 6 days into the machine last night. My question is, what temp is suggested to get this going? 78? I’m a weekend baker so a little more guidance on that would be helpful. Thanks!
Joanne – Yes, 78F is a good temperature for your starter. When you are creating a starter from scratch, it is important to keep it warm and feed it daily. Once you have an established culture, you can adjust the temperature and feeding schedule in order to feed less frequently if you’d like. If you have more questions at all, please email us at contact@brodandtaylor.com. We are always happy to answer baking questions.
I’d like to know the insulation material used inside the Sourdough Home. The walls seem pretty thick and that is a good point but is it polyurethane foam or polystyrene? Thank you.
Thomas – The insulation material in the Sourdough Home is polystyrene.
My SD starter is not doubling today is day 7 it had a small rise, many wholes I see it’s alive. Temp of SD 68 yet SD home was 88, kitchen is 68.
Sandra – A 7-day-old starter is still quite young, and it is not abnormal for a starter to take longer than that to become active and begin doubling on a regular basis. As far as the temperature of the Sourdough Home, please reach out to our customer service at contact@brodanadtaylor.com. The temperature of your starter should not be 68F if you have the Home set to 88F.
I am thinking of purchasing this. I was wondering how loud it is since it will be running continuously. Also, how much power does it use?
Brenda – The Sourdough Home has a fan that runs intermittently. It is the same fan you would find in a computer and has a similar noise level, so really only a little. The maximum power in cooling mode is 38W, and the maximum in heating mode is 20W.
I’m an at-home baker. Mosty heirloom grains for sourdough boules. (Local mill is terrific: camascountrymill.com) Just started using the proofer, and it makes the multi-step fermentation process so much more reliable. Thanks! Just discovered the “Sourdough Home.” I’ve basically kept my sourdough in the fridge, and the night before a make bread, I mix a 1:4:4 batch (using unbleached, white, bread or AP flour) and leave on the kitchen counter (about 68 degrees F.). In the morning, I make a Levain with 1 part from the mix, 2 parts water, 1 part whole wheat flour, and 1 part unbleached, white, bread or AP flour. Put that in the proofer at 78 degrees. When it doubles (in about 3 hours), I added it to the autolyse dough I made at the same time as the Levain. There’s usually excess of what I call the “supercharged” starter, which I just add back to my base supply of starter in the fridge. Everything works fine, but … what intrigued me was the idea of adjusting flavors (e.g., increasing the “sourness” of the final product) by different temperatures and timing of the two steps to produce the Levain. I bake about once a week. So my thought is this: Continue to maintain my “base” sourdough in the fridge but when I prepare to bake, use the Sourdough Home for the first step (“supercharging” the starter) and the second step (producing the Levain). What do you think?
Paul – It sounds like you have a system that works well for you and your starter. You can certainly use the Sourdough Home for your starter & levain instead of the Proofer, but from your explanation, it sounds like the Proofer is working well, and we don’t know if there is a need for you to change your approach. You may find our article on controlling the sourness of sourdough interesting. https://brodandtaylor.com/blogs/recipes/make-sourdough-more-sour Feel free to email us at contact@brodandtaylor.com if you would like to chat more about this or have any other questions.
What size jar fits into the Starter Home?
Paula- A 1-quart container will fit into the Sourdough Home. The internal dimensions are 7½in H x 5⅛ W x 5 ½ D. We frequently use a number 743 Weck jar.
I love my sourdough home. Am a newbie at all this and I have been feeding every day. However, I am going away for a week and wondering if I can just lower the temperature to 50 and it will be OK
Linda- Yes! Before you leave, we recommend feeding your starter and placing it in the Sourdough Home set to 41F. It should be in great shape when you come back.
Questions about feeding: When I take my started out of the Sourdough Home (45 degrees), I feed it and let it rise in the Home at 77 degrees. After it rises (is this the levain) I use a portion for my sourdough mix. With the leftover levain, I have been doing a 1:1:1 mixture (King Arthur advice) and putting it back in the Home to repeat the above. Am I doing the correct thing for the best result? Thanks.
Dave – It sounds like you’ve established a routine that suits you and as long as it keeps your starter in good health and produces results you are happy with we see no reason to change it. However, it’s worth noting that a 1:1:1 feeding ratio can lead to a quicker ripening process, even at cooler temperatures, which might necessitate more frequent feedings than you’d prefer. To potentially reduce the frequency of feedings and manage the growth rate of your starter more efficiently, you could consider adjusting the feeding ratio to something like 1:4:4. This larger ratio of food (doesn’t necessarily me more by weight, just a larger ratio) to starter could help extend the time between feedings by slowing down the ripening process, especially useful if you’re aiming for a schedule that’s more manageable for you. Ultimately, the “correct” approach is highly personal and depends on your baking schedule and how often you wish to refresh your starter. Don’t hesitate to reach out with any more questions. We are always happy to help!
I thought I read somewhere that it is advisable to leave the door open in between temperature changes. Is this true?
Linda – Yes, in the manual there is some information about it. This recommendation only applies to large temperature changes: When changing the temperature setting from cooling to heating (or heating to cooling) more than a 20°C (36°F) difference, first turn off the Sourdough Home and prop the door open for approximately 5 minutes. While this is not absolutely necessary, it will reduce the stress on the electronics and possibly extend the lifetime of the appliance.
Forgive me I am somewhat confused by your table for feeding schedules based on temperature. In the table you list 1:4:4 as the seed ratio; but in the “notes” you say your guidelines are based on a 100% hydrated starter which I have come to believe is a 1:1:1 ratio? What am I missing? Thanks in advance for your help. BTW I live in a log home that is very drafty when the wind blows. The Home is a lifesaver!!
I have placed my starter in the Sourdough home. This is first time I’m using it. Do i leave the 2 racks in the bottom and set the jar on top?
Kent – Great question and we are happy to hear you are enjoying your Sourdough Home! We understand these concepts can be tricky, so we’ll try to clarify. The 1:4:4 ratio means 1 part starter, 4 parts flour, and 4 parts water by weight (e.g., 10g starter, 40g flour, 40g water). In baker’s percentages, each ingredient’s weight is compared to the flour’s weight, which is always set at 100%. A 100% hydrated starter has equal parts of water and flour by weight. So, with our 1:4:4 example, the water weight (40g) equals the flour weight (40g), resulting in a 100% hydration level. You are correct that a 1:1:1 starter is also 100% hydrated. In fact, any time the second number (representing flour) and the third number (representing water) in a starter ratio are the same, the starter is at 100% hydration, such as with ratios 1:1:1, 1:4:4, 1:10:10, etc. I can see how the note “These guidelines are based on a 100% hydration starter” might seem redundant. By default, a 1:4:4 feeding maintains 100% hydration. The only difference between these ratios is the proportion of starter to flour and water, which adjusts the starter’s activity and the timing between feedings. We hope this clears up the confusion!
Dona – Yes, leave one rack on the bottom and place your starter jar on top of that. The additional rack is intended for use on the upper shelf. If you don’t need it right now, you can set it aside or keep it inside the Sourdough Home by stacking it on the bottom rack. Doubling up the rack will not impact the operation or performance of the Sourdough Home at all.
Como adquirir este produto Sourdough home? Resido no Rio de Janeiro, Brasil.
Fabio – Nosso distribuidor europeu enviará o Sourodugh Home para o Brasil. https://brodandtaylor.eu/en/product/sourdough-home/
Hello again…old freshloaf friend. How long should it take my SDH to reach a set temperature…so far all day has not reached 45F? Kind regards Sylvia h Ps. Tested your first proofer long while back. Much older but still baking
Sylviah – Depending on your room temperature, it can take anywhere from 4-6 hours to reach the set temperature. If you need more assistance, please reach out to our customer service at contact@brodandtaylor.com or call us at (800) 768-7064.
Greetings. My question is does the machine have the storage capacity to hold 2 BALL pint containers at the same time? Thanks, Biggzz
Biggzz – It depends somewhat on the style and brand. We found that some pint jars do fit in two at a time, but two wide-mouth pint Ball jars will not fit in the Sourdough Home at the same time.
Can I use glass or plastic container for the starter? Also, can I use a ‘towel-like’ cover on the container in the Home?
Eilieen – Yes, you can use either a glass or a plastic container for your starter, and a cloth cover will work just fine.