Daikon Radish in 5% brine
10.0 days at 68 °F · pH target 3.80 · outside typical range
Brine calculator
For submerged vegetables (cucumbers, peppers, cauliflower, garlic scapes). Salt mass is expressed as a percentage of water mass — NCHFP convention.
1 L of water ≈ 1 kg. 3.5% brine = 35 g salt per litre.
About Daikon Radish
Long white East Asian radish. Core of kkakdugi (cubed radish kimchi) and Japanese takuan (rice-bran pickled radish). Sweeter and milder than red radish. Brines quickly due to high water content.
Fermentation data
- Default salt
- 3%(you are viewing 5%)
- Salt range
- 2.5–4%
- Time at 68°F
- 10.0 days
- pH target
- 3.80
- Water content
- 94%
- Preferred styles
- kimchi kkakdugi, takuan style
Note: 5% is outside the typical brine range for Daikon Radish (2.5–4%). The recommended default is 3%. View 3% brine + Daikon Radish.
Technique
For kkakdugi: peel, cube 1.5cm, salt 3%, rest 30 min to draw water, drain, toss with kimchi paste. Ferment 5-7 days at room temp then fridge. For half-brine style: cube, cover with 4% brine, 7-10 days.
Brine notes at 5%
50g salt per 1L water. Higher salt + cooler temp (60-65°F) = longer safe ferment + deeper flavor. Used for traditional long-ferment sour pickles + Eastern European shelf-stable preservation. Not for cucumbers that will be refrigerated at half-sour — saltier than necessary.
What a 5% brine does for Daikon Radish
A 5% brine is 50 g of salt in every litre of water. That salt pulls moisture out of the daikon by osmosis and, more importantly, tilts the jar in favour of salt-tolerant Lactobacillusover the spoilage microbes that can't handle it. A stronger brine ferments more slowly, keeps the vegetable firmer and crunchier, and stores longer; a weaker one ferments faster and softer.
Safety: Safe pickle brine. 3.5% is the most common starting point for cucumbers and peppers. Target pH once soured: ~3.80 (below pH 4.6 is the fermented-vegetable safety threshold).
Brine recipe for a 1-litre jar
| Water | 1 L (1000 g) |
| Salt (5%) | 50 g |
| Daikon Radish, packed | ~650 g |
Dissolve the salt fully, cool the brine to room temperature, pack the daikon, and pour over until submerged. Use the calculator above to scale to your exact jar or crock.
How long Daikon Radish takes at your kitchen temperature
Daikon Radish takes about 10 days in a 5% brine at the 68°F baseline. Fermentation speeds up as the room warms and slows as it cools — the days below are that baseline scaled by temperature:
| Kitchen temp | Approx. days | What to expect |
|---|---|---|
| 55°F (12.8°C) | 26.9 d | slow, clean |
| 60°F (15.6°C) | 19.2 d | classic range |
| 64°F (17.8°C) | 14 d | classic range |
| 68°F (20°C) | 10 d | baseline |
| 72°F (22.2°C) | 8 d | fast — check daily |
| 76°F (24.4°C) | 6.3 d | fast — check daily |
Temperature multipliers after the Noma Guide to Fermentation (pp. 53–57) and Katz, The Art of Fermentation (ch. 3). Below ~50°F ferments effectively stall; above ~82°F, mould and kahm yeast rise fast — taste and refrigerate early.
Daikon Radish in 5% brine — FAQ
How much salt do I need for a 5% brine?
Dissolve 50 g of non-iodised salt (fine sea or pickling salt) in every 1 litre (1000 g) of water — that is 5% by weight. For a partial jar, scale it with the calculator above; the ratio stays the same.
How long does Daikon Radish take in a 5% brine?
About 10 days at the 68°F baseline. It runs slower in a cool room (~19.2 days at 60°F) and faster when it's warm (~6.7 days at 75°F). Start tasting from day 7 and refrigerate once it's as sour as you like.
Is a 5% brine strong enough and safe?
Safe pickle brine. 3.5% is the most common starting point for cucumbers and peppers. As it ferments, daikon should drop to about pH 3.80 — comfortably under pH 4.6, the acidity threshold the NCHFP and FDA treat as safe for fermented vegetables.
Why keep the daikon under the brine?
Under the liquid the environment is oxygen-free, which is exactly what the Lactobacillus you want thrives in and what surface moulds and kahm yeast cannot tolerate. Anything poking above the brine is at risk — weigh the vegetables down so everything stays submerged.
Is cloudy brine or a white film normal?
Cloudy brine and a little sediment are normal signs of an active lacto-ferment. A thin, flat white film on the surface is usually kahm yeast — harmless; skim it off. Only fuzzy, raised, or blue/green/black growth is mould, in which case discard the batch.
Explore other brine concentrations for Daikon Radish
- 2.5% — lightly-salted vegetable brine
- 3% — standard half-sour brine
- 3.5% — NY deli half-sour
- 5% — full-sour / long-ferment brine (current)
- 6% — fish sauce / garum base
Sources
- Maangchi — kkakdugi recipe
- NCHFP (UGA) — Fermented and Pickled Products
- Linda Ziedrich, The Joy of Pickling (3rd ed., 2016)
For educational use only. Consult your local food safety authority for commercial production.
The kit for fermenting Daikon Radish
A short, honest kit for lacto-fermentation. The scale is the one that matters most — everything here is by weight.
- Digital kitchen scale (0.1 g)Salt % is by weight, not volume — a 0.1 g scale is what makes the math above accurate.View on Amazon →
- Glass fermentation weightsKeep vegetables submerged under the brine line so they ferment safely without mould.View on Amazon →
- Airlock fermentation lidsLet CO₂ escape while keeping oxygen out — wide-mouth lids that fit standard jars.View on Amazon →
- Wide-mouth mason jarsThe workhorse vessel for kraut, kimchi and brine pickles — 1 qt and ½ gal sizes.View on Amazon →
- Pickling / fine sea saltPure salt with no iodine or anti-caking agents, which can cloud brine and inhibit fermentation.View on Amazon →
- Stoneware fermentation crockFor scaling past the jar — a water-sealed crock for 5 L+ batches with built-in weights.View on Amazon →
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