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Last edited on January 27, 2021. View history

daikon Daikon

Raphanus sativus Longipinnatus group
Also known as daikon radish (en) mooli (en) white radish (en) winter radish (en) Oriental radish (en) long white radish (en) Japanese radish (en) Chinese white radish (en)

A variety of radish

How to sow daikon: Direct seed outdoors

Sun requirement for daikon: Plant in Full Sun

Daikons are a mild-flavored, large, long, white radish. They are native to Southeast and continental East Asia and do best in cool weather. They are grown for culinary and tillage purposes. Daikons are much larger than their cousin, the Icicle Radish: they can grow to 50cm long and 10cm in diameter. Smaller daikon are less fibrous and preferred for soups and stews, but larger daikon can be eaten raw, grated into salads, and pickled. Daikon can also be grown for their sprouts, which grow rapidly and add a nice, bitter crunch to salads and sandwiches. Daikon are a valuable tillage radish and winter cover crop because the roots leave behind large cavities in the soil when they decay. As they grow, the roots aerate the soil and break up the hardpan, making it easier for water and nutrients to move through the soil. Subsequent root crops (like potatoes) can penetrate the soil better, grow larger, and produce higher yields. Daikon's large tap roots also soak up micro- and macro-nutrients, which become available to subsequent crops after the daikon decay.

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Daikon facts

Lifespan

Annual living and reproducing in a single year or less
16 weeks median lifespan
First harvest expected 10 weeks after planting

Height × spread

50cm × 20cm

Row Spacing

10cm

Grown for

bulb harvested 2 times
Optimal temperature 12–25 °C
Absolute temperature 3–30 °C
FAO EcoCrop
Optimal rainfall 800–1000 mm/year
Absolute rainfall 500–2800 mm/year
FAO EcoCrop
Optimal soil pH 6–7
Absolute soil pH 5.2–8.3
FAO EcoCrop

Crop cycle

21–135 days
FAO EcoCrop

Max altitude

2000 m
FAO EcoCrop

Optimal light

clear skies
FAO EcoCrop
What are growing degree days?

A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.

Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.

For daikon, the FAO EcoCrop database gives a lowest growing temperature of 3°C and a shortest growing cycle of 21 days at its best temperature, about 326 growing degree days to a first harvest.

Where you've told us where your garden is, we use this and the weather there to predict when your daikon will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.

Growing daikons

  1. Dig the bed fine 1 week before sowing
  2. Water regularly at sowing every week
  3. Thin the seedlings 1 week after sowing
  4. Sow another batch 2 weeks after sowing every 2 weeks
  5. Pull the radishes at first harvest
  6. Pull out plants that have bolted 3 weeks after first harvest

How members grow daikons

Sunniness

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Planted from

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Harvested for

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Varieties of daikon

Image of aomaru koshin daikon

aomaru koshin daikon

Raphanus sativus
Image of purple daikon

purple daikon

Raphanus sativus
Image of tokinashi daikon

tokinashi daikon

Raphanus sativus
Image of watermelon radish

watermelon radish

Raphanus sativus

Plant daikons with

Photos

Daikon plantings

IMG_20191123_092422
IMG_20191123_092422
by shiny

Daikon harvests

Watermelon Radishes
Watermelon Radishes
by cropbot
2019-12-24_03-45-13
2019-12-24_03-45-13
by shiny
IMG_20191224_135215
IMG_20191224_135215
by shiny
IMG_20191224_140409
IMG_20191224_140409
by shiny

Daikon seeds

IMG_20191008_082425
IMG_20191008_082425
by shiny
IMG_20191008_084212
IMG_20191008_084212
by shiny

Video

Where daikons grow

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Ecological requirements

Data from the FAO EcoCrop database for Raphanus sativus var. radicula L. [Pers]

Family / Taxonomy Magnoliopsida
Dilleniidae
Capparales
Cruciferae
Life form herb
Life span annual, biennial
Habit erect
Optimal soil depth medium (50-150 cm)
Optimal soil texture medium, light
Optimal soil fertility high
Optimal soil drainage well (dry spells)
Optimal soil salinity low (<4 dS/m)
Photoperiod short day (<12 hours), neutral day (12-14 hours), long day (>14 hours)

Learn more about daikons

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