How to Ferment Vegetables at Home with a Simple Salt Brine

Choose your method: brine or dry salting

There are two basic methods. Dry salting works for cabbage, which holds a lot of water: you shred it, mix in salt and squeeze it until it makes its own brine. This is how sauerkraut and kimchi are made. A common starting point is 2 percent salt by weight of the vegetables, which is about 20 grams of salt per kilogram of cabbage.

Brine fermenting suits whole or chunky vegetables like carrots, green beans, cauliflower, radishes and cucumbers. You dissolve salt in water and pour it over the packed vegetables. A typical brine range is 2 to 5 percent salt by weight of the water, and many beginners use about 3.5 percent, which is around 35 grams of salt per liter of water. Weigh the salt with a kitchen scale, since the volume of a tablespoon varies a lot between salt types.

Equipment: jars, crocks and weights

A wide-mouth quart or half-gallon glass jar is enough to start. The most important job of your gear is to keep the vegetables under the brine, because food above the liquid is where mold grows. Glass or ceramic weights, a small clean zip bag filled with brine, or a cabbage leaf pressed on top can all do this.

If you ferment more than a jar or two at a time, a crock with a water-seal lid or built-in weights is easier to manage, and it blocks air and insects without the need to burp lids. Our guide to fermentation crocks compares sizes and lid styles. Another option is a jar lid with an airlock, which lets carbon dioxide escape while air stays out. See the airlocks guide for the types that fit mason jars and similar containers.

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Step by step: a basic jar ferment

Wash the jar and weights in hot soapy water and rinse well. Trim and cut your vegetables, then pack them in firmly, leaving about an inch of space below the rim. Dissolve the salt in water (use non-chlorinated water, or let tap water sit out or boil and cool it) and pour the brine over the vegetables until they are fully covered.

Add flavorings if you like, such as garlic, dill, peppercorns or a bay leaf. Place a weight on top so nothing floats up, then close the jar loosely or fit an airlock lid. Set the jar on a plate in case brine bubbles over, out of direct sunlight, and check it daily for the first few days.

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Temperature and timing

Most vegetable ferments do well at roughly 65 to 75 F (18 to 24 C). Warmer rooms speed things up but can make the texture soft and the flavor harsh, while cooler rooms slow the process and often give a cleaner result. Small bubbles in the first one to three days are a good sign that the lactic acid bacteria are working.

Pickled carrots and green beans can taste good after about 5 to 10 days. Sauerkraut is often left from 1 to 4 weeks. Taste with a clean fork every few days and move the jar to the refrigerator when it is sour enough for you. Cold slows fermentation down a lot, and most ferments keep for weeks to months in the fridge, with the flavor getting stronger over time.

Normal signs and when to throw it out

Cloudy brine, sediment at the bottom, bubbles and a sour smell are all normal. A flat, white, wrinkly film on the surface is usually kahm yeast, which is harmless but can taste off, so you can skim it away. Fuzzy, raised patches in white, blue, green, black or pink are mold, and mold means the batch should be discarded.

Throw the jar out if the vegetables are slimy and smell rotten rather than sour, if mold has grown, or if you are not sure. When in doubt, discard it. Using enough salt, keeping vegetables submerged and starting with clean gear are the best protection. Some brewers check the finished brine with pH strips or a meter, aiming for below 4.6, and our pH meter guide covers options.

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Salt, water and vegetable choices

Use plain salt without anti-caking agents, such as pickling salt, canning salt or fine sea salt. Iodized table salt is often avoided because additives can cloud the brine. Because different salts have different crystal sizes, measuring by weight is much more reliable than spoons.

Choose fresh, firm vegetables and wash them well. Cucumbers stay crunchier if you trim the blossom end. Adding a tannin-rich leaf such as grape or oak is a traditional trick for crisper pickles. Skip soft, bruised produce, since it ferments to mush.

Frequently asked questions

Do I need a starter culture? No. Lactic acid bacteria already live on fresh vegetables, and salt gives them an advantage. Some people add a spoonful of brine from a previous batch, but it is optional.

Why are my vegetables floating? Vegetables rise as gas builds up. Use a weight or press them down so they stay under the brine, and top up with brine if the level drops.

Should I seal the jar tightly? Fermentation makes carbon dioxide, so a tightly sealed jar can build up pressure. Use an airlock, a water-seal crock, or loosen the lid and burp it daily.

How long do fermented vegetables last? In the fridge they commonly keep for several weeks to a few months. If they smell rotten, look slimy or show mold, throw them out.