How to Ferment at Home

The Simple Truth About Home Fermentation

Fermenting food at home is one of the most straightforward things you can do in the kitchen. It doesn't require special skills, expensive equipment, or a science degree. At its most basic, you're combining food with salt, putting it in a jar, and letting beneficial bacteria do the rest.

This guide is your practical reference for the “how” of fermentation. Not the history or the health benefits (we cover those in our Fermentation for Beginners and Fermented Foods Benefits guides) — just the hands-on knowledge you need to start fermenting successfully today.

The Two Methods You Need to Know

Almost every vegetable ferment uses one of two methods. Once you understand both, you can ferment virtually anything.

Method 1: Dry Salting

Used for vegetables with high water content that release their own liquid when salted. You chop or shred the vegetables, toss them with salt, massage or pound them until they release juice, then pack everything tightly into a jar so the vegetables sit below their own liquid.

Best for: cabbage (sauerkraut, kimchi), shredded carrots, beets, radishes, onions

Method 2: Brine Submersion

Used for whole or large-cut vegetables that don't release enough liquid on their own. You prepare a salt water solution (brine), place the vegetables in a jar, and pour the brine over them until everything is submerged.

Best for: whole cucumbers (pickles), green beans, cauliflower, peppers, garlic cloves, mixed vegetable medleys

Salt: Getting the Ratio Right

Salt is the single most important variable in fermentation. It controls the speed of fermentation, the texture of your vegetables, and which bacteria thrive. Too little salt and you risk off-flavors, mush, or mold. Too much and fermentation stalls.

For Dry Salting

Use 2% salt by weight of the total vegetables. This is the sweet spot for most ferments.

Here's how to calculate it:

• Weigh your prepared vegetables in grams
• Multiply by 0.02
• That's how many grams of salt to add

Example: 1,000g of shredded cabbage × 0.02 = 20g of salt

For Brine Submersion

Use a 3–5% brine (salt dissolved in water). The standard starting point is 3.5%.

Here's how to make it:

• For every 1 liter (1,000g) of water, dissolve 35g of salt
• Stir until fully dissolved
• Let it cool to room temperature before pouring over vegetables

Step-by-Step: Your First Dry Salt Ferment

Let's walk through the process using sauerkraut as the example. This same method applies to any dry-salted vegetable ferment.

Step-by-Step: Your First Brine Ferment

Now the brine method, using pickles as the example.

Temperature and Timing

Temperature is the gas pedal of fermentation. Understanding it gives you control over speed and flavor.

How to Know When It's Done

There's no single “done” point for most ferments — it's a spectrum. Here's how to tell when things are where you want them:

• Taste it — this is your most reliable tool. Is it tangy enough? Sour enough? If it still tastes mostly like raw vegetables, give it more time.
• Bubbles — active bubbling means fermentation is happening. When bubbling slows significantly, the most active phase is over.
• Aroma — it should smell pleasantly sour and tangy, like pickles or sauerkraut. Not rotten, not like garbage.
• Texture — vegetables should retain some crunch. If they're getting soft, it may be time to refrigerate.

When you're happy with the flavor, move the jar to the fridge. Cold temperatures dramatically slow fermentation, essentially pausing the process. Most fermented vegetables will keep for months in the fridge.

Troubleshooting Common Problems

White film or scum on the surface (kahm yeast)

A thin white film on the brine surface is kahm yeast. It's harmless but can give a slightly off flavor if left unchecked. Skim it off with a spoon and make sure your vegetables stay submerged. It's more common in warmer temperatures and lower-salt ferments.

Fuzzy mold (green, black, white, or pink fuzz)

Actual mold is fuzzy and raised — it looks like what grows on old bread. If it's on a small area of the surface and hasn't penetrated the brine, you can scoop it off along with an inch of surrounding vegetables. If it's widespread, below the brine, or the ferment smells off — discard and start over. Prevention: keep vegetables submerged and use enough salt.

Soft or mushy vegetables

Usually caused by too little salt, too high temperature, or fermenting too long. For crunchy pickles, use the blossom-end trim trick, ferment at cooler temperatures, and use a slightly higher salt brine (4–5%). Adding a grape leaf or oak leaf (which contain tannins) can also help maintain crunch.

Too salty

You used too much salt, or it hasn't fermented long enough. Give it more time — the bacteria consume salt as they work, so the flavor will mellow. You can also rinse fermented vegetables briefly before eating if they're still too salty after fermentation.

Not sour enough

Give it more time. Sourness develops gradually as lactic acid builds up. If it's been over a week and nothing seems to be happening, your environment may be too cold. Move the jar to a warmer spot or be patient.

Overflowing jar

Active fermentation produces CO2, which can push brine up and over the rim. Always leave at least an inch of headspace, and place your jar on a plate or tray. This is normal and a sign that things are working.

Beyond Vegetables: Other Things to Ferment at Home

Once you're comfortable with basic vegetable fermentation, the world opens up. Here's what else you can make at home:

• Kombucha — fermented tea. Requires a SCOBY (symbiotic culture of bacteria and yeast) as a starter.
• Water kefir — a fizzy probiotic soda made with water kefir grains and sugar water. Faster than kombucha.
• Milk kefir — tangy, drinkable fermented milk. Like yogurt but with more diverse bacterial cultures.
• Yogurt — heat milk, add a spoonful of existing yogurt as starter, keep warm for 6–12 hours.
• Sourdough — wild-yeast bread. Requires building a starter over about a week, then you can bake with it indefinitely.
• Hot sauce — blend fermented chili peppers into a sauce with more depth and complexity than anything cooked.
• Tepache — fermented pineapple drink from Mexico. Uses pineapple scraps and is ready in 2–3 days.
• Beer and mead — alcohol fermentation. More equipment involved but deeply rewarding.

Setting Up Your Fermentation Station

You don't need a dedicated space, but having a consistent spot helps. Here's what makes a good fermentation station:

• Out of direct sunlight — UV light can inhibit beneficial bacteria. A kitchen counter away from windows, a pantry shelf, or the top of the fridge all work.
• Stable temperature — avoid spots near ovens, heaters, or exterior walls that fluctuate. Consistency matters more than hitting an exact number.
• Easy to monitor — somewhere you'll see it daily so you remember to check on your ferments and burp lids if needed.
• A tray underneath — active ferments can overflow. A sheet pan or plate catches any spills and saves your counter.

Check out our recommended tools for a curated list of jars, weights, lids, and other supplies that we actually use and recommend.