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What you actually need to start fermenting vegetables
Five items. Everything a shop will try to sell you beyond this list is a convenience, and we will say which conveniences are worth it.
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- A wide-mouth glass jar. A quart is the right size for a first batch. Wide-mouth, because every weight and lid in the category is sized to it.
- A lid that lets gas out. Fermentation produces carbon dioxide. A silicone airlock cap vents it without letting air in.
- A weight. Anything above the brine meets air. A glass weight holds the vegetables under.
- Non-iodized salt. Sea salt or pickling salt. Table salt with anti-caking agents clouds the brine.
- Vegetables. Start with cabbage. It brings its own water and it is forgiving.
That is the whole list. You do not need a crock, an airlock bubbler, a tamper, a pH meter, a starter culture, or a special fermenting vessel with a brand name on it. Those are all real products and some of them are good; none of them is required to make a jar of sauerkraut that works.
What each item is actually doing
The jar is a container and nothing more. Glass because it is inert against an acidic brine; wide-mouthed because you have to get your hand and a weight in and out of it.
The lid is solving one problem: a sealed jar builds pressure and an open jar lets air in. A one-way valve does both jobs with no maintenance, which is why it beats the traditional water bubbler for a beginner. We rank the types in best fermentation lids.
The weight is the item beginners skip and then regret. Almost every failed first ferment failed at the surface, where a floating shred met air. A weight is the fix, and a folded cabbage leaf is the free version of it — see fermentation weights.
The salt is doing the actual work. It draws water out of the vegetables to make the brine and it slows the organisms you do not want while the ones you do want get established. Getting the ratio right matters more than any piece of equipment on this page, and it is covered with sourced guidance in how to make sauerkraut in a jar.
The conveniences that are worth it
Three upgrades genuinely earn their place once you are past the first jar:
- More jars. The cheapest upgrade in the hobby. Two ferments running at once costs a few dollars more than one.
- A matched lid-and-weight set. Buying them apart is how you end up with mismatched mouth sizes.
- A crock, but only if you ferment in volume. The case for and against is in crock versus mason jar.
Buying it in one order
If you own nothing, a fermentation kit plus jars is the single-order version of this list, and it removes the mouth-size mistake. If you own jars already, buy an airlock cap and a weight in the mouth size you have and you are done. The complete costing across both scenarios is on what a complete first setup costs.
Frequently asked
Questions
+What do I need to start fermenting vegetables?
A wide-mouth glass jar, a lid that vents gas, a weight to keep everything under the brine, non-iodized salt, and vegetables. Cabbage is the easiest first choice because it releases its own water.
+Do I need an airlock to ferment vegetables?
No, but it removes a daily chore. Without one you loosen the lid and burp the jar each day to release carbon dioxide. An airlock cap does that on its own and keeps air out at the same time.
+Can I use table salt for fermenting?
Use non-iodized salt — sea salt or pickling salt. Iodized table salt and the anti-caking agents in it cloud the brine and can affect the ferment. It is one of the cheapest items on the list, so there is no reason to compromise.
+Do I need a fermentation crock?
Not for a first batch. A crock is a capacity upgrade, not a quality one — it ferments the same way a jar does. Buy one when you are fermenting several liters at a time.
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