Spend approximately five minutes in the sourdough baking world and you'll discover something: we have a lot of rules.

Your starter must double. You must feed it 1:1:1. You must keep it in the refrigerator. You should never do this, always do that, and if your grandmother didn't personally carry your starter across the Oregon Trail, apparently your bread is doomed.

Okay, I made that last one up. But only barely.

Sourdough is an ancient method of making bread, yet somehow we've managed to turn flour, water, salt, and wild yeast into something requiring approximately the same level of confidence as disarming a bomb.

Social media hasn't exactly helped. For every baker telling you there is one thing you absolutely must do, there's another telling you that doing that exact thing will personally offend the sourdough gods.

The truth is that sourdough is wonderfully adaptable. Your kitchen, flour, starter, temperature, schedule, and even the bread you want to make all matter.

So let's talk about ten of those supposed sourdough “rules”—and why you should absolutely break them whenever you feel like it.

Rule #1: Your Starter Is Ready When It Doubles

Don't be fooled by the TikTok bakers who tell you that once your starter doubles, it's ready.

Some starters double. Some triple. Some—mine, for example—even quadruple.

Astrid has apparently never been particularly interested in moderation.

What matters isn't reaching an arbitrary line on the jar. What you're really looking for is peak activity. As your starter rises, the surface will usually be rounded or domed. At peak, you'll see lots of bubbles and a surface with bubbly peaks and valleys, but the starter has not started receding in the jar yet.

Once you learn your starter's rhythm, you'll start recognizing its cycle:

The rise: Starter is growing, and we're anxiously watching for it to peak.

The peak: Starter has reached its most active point, and we're trying desperately not to miss it.

The fall: Oops, we missed it! The starter is running out of food, activity is slowing, and it's beginning to deflate in the jar.

That's the sourdough emotional roller coaster.

Learning to recognize that cycle is far more useful than drawing a line on your jar and staring at it like you're waiting for a pregnancy test.

Rule #2: You Have to Feed Your Starter 1:1:1

A 1:1:1 feeding means one part starter, one part flour, and one part water by weight, and I actually think it's a fantastic place to start.

It helps you learn how your starter behaves—how quickly it rises, what peak looks like, and how long it takes to begin falling.

But once you understand that rhythm, feeding ratios become a tool—not a commandment carved into a stone tablet.

You'll see ratios written as starter : flour : water. A 1:5:5 feeding means one part starter, five parts flour, and five parts water. Changing those proportions changes the amount of fresh food available to the culture and can change how long it takes to move through its cycle.

I use everything from 1:1:1 to 1:10:10 when building the levain I bake with. Those ratios let me adjust both timing and the amount I'm building.

And you don't have to maintain a 100% hydration mother starter, either. Hydration simply refers to the amount of water compared with flour by weight. A 100% hydration starter has equal weights of flour and water. Mine doesn't—and we'll get to that in a minute.

The point isn't to find one magic ratio and use it forever. It's to understand what those changes do so you can make sourdough work with your schedule instead of allowing your starter to dictate your entire day.

Because eventually it's nice to do something revolutionary like leave the house.

Rule #3: Maintaining a Sourdough Starter Is Incredibly Wasteful

Beginner instructions can make starter maintenance sound incredibly wasteful: keep some starter, feed it, throw most of it away, and repeat forever.

Which admittedly sounds less like baking and more like you've adopted a very wasteful flour Tamagotchi.

When you're first establishing a starter, yes—there's going to be discard. But maintaining an established starter doesn't mean you have to keep a giant jar of it on your counter.

First, a little terminology, because sourdough apparently needed its own vocabulary too.

My mother starter is the small culture I maintain every day. Her name is Astrid, she's roughly 40 grams, and I keep her stiff, meaning she contains less water than flour.

I don't typically scoop directly from Astrid to make bread. Instead, when I feed her, I remove roughly 35 grams and use that to create a levain specifically for whatever I'm planning to bake.

You'll sometimes hear levain and active starter used interchangeably. The distinction I make is about purpose: Astrid is my mother starter—the culture I maintain long-term. A levain is a separate build I create from Astrid specifically for baking. Once that levain has been fed and reaches peak, it's active and ready to use. When one of my recipes calls for active starter, that levain is what I'm talking about.

Astrid stays stiff, but my levain is 100% hydration, with equal weights of flour and water.

Keeping Astrid stiff also helps me control her schedule. With my flour, feeding routine, and kitchen conditions, she typically reaches peak at about 12 hours. That lets me feed her morning and night while sticking pretty closely to peak-to-peak feeding—feeding again around peak rather than routinely waiting for her to collapse first.

That's what works best for my starter. Your starter may have other plans. Starters are considerate like that.

And here's where that little 40-gram mother starter becomes pretty impressive.

A few days before a market, I begin larger levain builds—sometimes as high as 1:10:10—and gradually build what I'll need. For a big market bake, Astrid can eventually produce as much as 5,000 grams of levain—about 11 pounds—just for my sourdough loaves.

When it's well aerated and at peak, that's roughly 2 to 2½ gallons of bubbly levain. Think two gallon jugs of milk—and then some—all filled with active starter.

Then I'll have another batch going, roughly the same size, for focaccias and everything else.

So on a big market bake, I can have around 22 pounds—or roughly 4 to 5 gallons—of active, bubbly levain going at once.

At that point, I haven't so much fed the starter as given it control of a significant portion of my kitchen.

And all of it traces back to Astrid, quietly hanging out on my counter at around 40 grams the rest of the week, looking completely innocent.

That's why I don't need to maintain a giant vat of starter all week. I maintain what I need and build more when I need it.

Now, about discard.

To discard simply means removing some starter before feeding the portion you're keeping. The removed starter is also commonly called discard—whether you throw it away or not.

Yes, we named something after throwing it away and then built an entire corner of the sourdough world around ways not to throw it away. Just go with it.

Most of the 35 grams I remove from Astrid becomes levain. You can also save discard for pancakes, cookies, crackers, and countless other recipes—but you don't have to. You can make those things with active starter or levain too, although you may need to account for hydration if you're making a substitution.

Discard can be useful. It doesn't have to become another sourdough obligation.

You already have one jar of fermented flour controlling portions of your schedule. You don't need to give it a roommate unless you want to.

Rule #4: A Sourdough Starter Has to Live in the Refrigerator

Oh, this one can start arguments.

My mother starter will never see the inside of the refrigerator.

That's my personal preference, and plenty of sourdough bakers strongly agree with me. Plenty of others strongly disagree.

Welcome to sourdough, where apparently even jar storage can become controversial.

I believe Astrid performs best when she's maintained at room temperature and fed regularly, so that's how I maintain her.

But the refrigerator is also an incredibly useful scheduling tool. Fermentation—the process happening as the wild yeast and bacteria consume available sugars—doesn't stop in the refrigerator. It just slows way down.

That makes refrigeration useful if you aren't baking regularly or simply need your starter to work around your schedule.

So while Astrid doesn't live in the refrigerator, that doesn't mean I think yours shouldn't.

There's a difference between “this is how I prefer to maintain my starter” and “this is the only correct way to maintain a starter.”

Sourdough internet could probably stand to embroider that on a pillow.

Rule #5: Sourdough Is Supposed to Be Really Sour

It's right there in the name, so this one at least has a reasonable defense.

But “sourdough” describes a method of fermentation—not a requirement that your bread make your face pucker.

Sourdough can range from incredibly mild to noticeably tangy depending on the starter, fermentation time, temperature, flour, and process.

Personally, I want fermentation to bring complexity and depth of flavor to my bread, not make it taste like somebody dared me to eat a lemon.

If you've tried sourdough before and decided you don't like it because it was aggressively sour, don't necessarily write it off altogether.

You may just not like that sourdough.

Rule #6: If Your Starter Falls, You've Ruined It

Remember our cycle?

Rise. Peak. Fall.

The fall is normal. If your starter has started falling, you didn't kill it. You just missed peak.

Congratulations, you're officially a sourdough baker.

Feed it. No funeral. No tiny starter casket. No dramatic announcement to your family that Astrid Jr. has left us.

I prefer peak-to-peak feeding, meaning I feed Astrid again around peak rather than routinely waiting until she's fallen and exhausted her available food. Because I've adjusted her hydration and feeding routine to fit my schedule, that happens pretty reliably about every 12 hours.

But missing peak happens. Baking is literally my business, and I still occasionally look at Astrid and think, Well... apparently we peaked without me.

It'll be fine.

Rule #7: An Old Starter Makes Better Bread

I say this as someone who absolutely adores having a heritage starter.

Astrid's history is special to me. She's descended from cultures with roots going back generations, and I love being part of that story.

But you do not need an ancient starter to make wonderful bread.

A well-established, healthy starter that you understand and maintain properly can make fantastic sourdough. An older starter may have a great story, but age isn't some magical bread-making superpower bestowed upon a jar because somebody wrote “1892” on it.

If that were how this worked, sourdough bakers would be trading starter pedigrees like purebred dogs.

Your starter doesn't need an impressive family tree. It needs food, consistency, and good care.

Rule #8: You Need a Ton of Special Equipment to Make Sourdough

You can spend an astonishing amount of money on sourdough equipment. This is a well-kept secret that I pray my husband never discovers, so let's all agree to keep that between us.

Bannetons. Lames. Dutch ovens. Dough whisks. Proofing boxes. Fancy jars. Specialty mats. Scoring tools. Thermometers. And approximately 47 adorable things the internet will convince you are absolutely essential.

I currently have something called a “Sourdough Home” sitting on my Amazon wish list. It is, essentially, a tiny climate-controlled home for my jar of fermented flour. It can warm or cool as needed to maintain the perfect temperature around the clock so Astrid can live in precisely controlled comfort.

Do I need it? Almost certainly not.

Do I want to perfectly pamper Astrid like the Viking princess she is?

Obviously.

Are some of these tools genuinely useful? Absolutely.

Have I personally purchased enough sourdough-related equipment to know this firsthand?

That's classified information.

But here's the other side of that: a few of my favorite and most-used baking tools came from Dollar Tree. Sourdough really doesn't care how much you paid for the thing you're using to make it.

If I were going to tell a beginner to spend money on one thing, it would be a decent digital kitchen scale. Measuring by weight makes sourdough much easier to learn and reproduce.

Beyond that? Start baking. Use what you have. Buy things when you discover they'll actually make your process easier.

And if you eventually find yourself owning six bannetons, three Dutch ovens, a proofing box, seventeen bench scrapers, and a drawer containing tools whose purposes your spouse does not fully understand...

Welcome to sourdough. We don't discuss receipts here.

Rule #9: Sourdough Is Gluten-Free

This one isn't funny, because getting it wrong can actually be dangerous.

Traditional sourdough made with wheat flour contains gluten. Fermentation changes the dough, but it does not magically turn wheat-based sourdough into gluten-free bread or make it safe for someone with celiac disease.

This is also why I don't offer gluten-free bread at Astrid's Kitchen. I work with wheat flour constantly, and my home bakery is not a dedicated gluten-free environment. Flour gets everywhere, and I can't confidently prevent cross-contact.

I'm not willing to tell someone a product is safe when I can't guarantee that it is.

Sometimes the responsible answer is simply no.

Rule #10: There Is One Right Way to Make Sourdough

And we've arrived at my favorite.

What's a new hobby without a whole army of people telling you there's one way you must do things—and another army standing directly across from them yelling the exact opposite?

Use warm water. Never use warm water. Refrigerate your starter. Never refrigerate your starter. Feed exactly 1:1:1. Feed based on your schedule. Stretch and fold exactly four times. No, three. No, six. Or—GASP—not at all.

I'm fairly certain if you search long enough, you'll eventually find someone willing to tell you that your bread failed because Mercury was in retrograde during bulk fermentation.

Eventually you realize something:

People have been making naturally fermented bread for thousands of years without the benefit of TikTok comments.

There are principles worth learning. Fermentation matters. Temperature matters. Ratios matter. Starter health matters. Understanding your dough matters.

But within those principles, there is an enormous amount of flexibility.

My process works in my kitchen, with my starter, around my schedule, for the bread I want to make.

Yours may look different.

And that's okay.

The sourdough police are not coming.

Learn the Rules. Then Learn Your Starter.

If you're new to sourdough, my advice isn't to ignore every rule you hear. Start simple. Learn a basic feeding. Watch your starter rise. Learn what peak looks like. Pay attention to temperature. Bake some bread. Make some mistakes. Let a loaf ferment too long. Cut another one short. Make some bread that comes out beautiful and some that looks like it could be used as a doorstop.

That's how you learn.

Eventually, you'll stop checking the clock every five minutes and start recognizing what your starter and dough are telling you. That's when sourdough starts feeling a lot less intimidating—and a lot more fun.

You don't need to do everything exactly the way I do it—or exactly the way your favorite sourdough creator does it.

You need to understand why you're doing it.

Then you can decide what works for you.

And if somebody on the internet tells you there's only one correct way? Don't worry. There's probably another baker three videos down telling you the exact opposite.

Welcome to sourdough.