Vegetable · leafy

Lacto-fermenting swiss chard: 2.50% salt, 10.0days at 68 °F

Best fermented in two parts: the crisp stems pickle like a mild celery, while the leaves ferment like a tender green. High water content makes the leaves wilt quickly, so they are often packed with the chopped stems for structure. A good way to preserve a glut of chard.

Salt calculator

Enter your vegetable weight and a salt percentage. We return the exact salt mass in grams, plus teaspoons for each common grain.

grams
%

Grain matters: one teaspoon of Diamond Crystal weighs half as much as one teaspoon of fine sea salt. Weigh in grams when you can.

25g salt
4.39 tsp 1.46 tbsp 0.88 oz

Based on Fine sea salt at 5.69 g/tsp.

Safe range for lacto-fermentation. 2% is the most common default for cabbage, kimchi and pepper mash.

All salt grains
GrainGramsTeaspoonsTablespoons
Diamond Crystal kosher25 g8.82.93
Morton kosher25 g5.211.74
Fine sea salt25 g4.391.46
Pickling / canning25 g4.551.52
Default salt
2.50 %
Salt range
2.00% – 3.00%
Time @ 68 °F
10.0 days
Target pH
3.50
Water content
~92%
Preferred styles
lacto ferment, brine pickle, mixed veg component

Technique

Separate leaves from stems. Cut stems into 1cm pieces and chop the leaves. Salt the combined weight at 2.5% and massage briefly, or brine the stems at 2.5% (25g salt per liter) and add the wilted leaves. Pack below the brine and ferment 7-14 days at 65-72°F; the stems stay crunch-forward.

Source: NCHFP (UGA) — fermented brine-pickle method. Last verified 2026-06-27.

Frequently asked questions

What percent salt for fermenting swiss chard?

2.50% by weight is the default for swiss chard (workable range 2.00%–3.00%). For 1000g swiss chard, that's 25.0g salt. Use non-iodised salt and weigh in grams — teaspoon equivalences vary by salt grain. Source: NCHFP (UGA) — fermented brine-pickle method.

How long to ferment swiss chard?

10.0 days at 68°F (20°C). Cooler kitchens (60-65°F) slow fermentation; warmer kitchens (75-80°F) roughly halve the time per 10°F increase. Start tasting from day 5; target pH 3.50 or below indicates complete primary fermentation.

What's the best technique for fermenting swiss chard?

Separate leaves from stems. Cut stems into 1cm pieces and chop the leaves. Salt the combined weight at 2.5% and massage briefly, or brine the stems at 2.5% (25g salt per liter) and add the wilted leaves. Pack below the brine and ferment 7-14 days at 65-72°F; the stems stay crunch-forward.

What category is swiss chard for fermentation?

Swiss Chard is a leafy vegetable. Best fermented in two parts: the crisp stems pickle like a mild celery, while the leaves ferment like a tender green. High water content makes the leaves wilt quickly, so they are often packed with th… Preferred fermentation style: lacto-ferment, brine-pickle, mixed-veg-component.

The kit for fermenting Swiss Chard

A short, honest kit for lacto-fermentation. The scale is the one that matters most — everything here is by weight.

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