Vegetable · root

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

Kohlrabi — the German turnip — is a Brassica oleracea cultivar grown for its bulbous, swollen stem rather than its root. Crisp, mild, and slightly sweet raw, it ferments into a snappy, slightly tangy pickle that retains its crunch for months. Common in Czech, German, and Korean cooking; in kimchi tradition it appears as a component in mixed-vegetable variants. The white-skinned variety ferments faster than purple; either works.

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
~90%
Preferred styles
brine pickle, kimchi component

Technique

Peel the tough outer skin (it can be thick — peel deep enough to remove all woody fibers). Cut into 1-cm matchsticks or 5-mm rounds. Pack into a jar with one bay leaf, a teaspoon of caraway seed, and a thin slice of horseradish or one crushed garlic clove per quart. Cover with 2.5% brine, weight, leave 1 inch headspace. Ferment 7-14 days at 65-72°F. Done when fully sour but still crisp at the bite. Refrigerate; will hold 4+ months.

Source: Katz — The Art of Fermentation (p. 99, Brassicas). Last verified 2026-05-12.