How to Grow Mibunas

By the SoilCommander Editorial Team, under the guidance of Nitin Sharma, Co-Founder · · How we check our facts

On this page
  1. Mibuna (Brassica rapa var. japonica)
  2. Quick Facts
  3. At a Glance
  4. Diseases
  5. Pests
  6. Soil & Growing Conditions
  7. Growth Stages
  8. Harvest & Storage
  9. Plan your Mibunas planting
  10. Growing Mibuna in another region
  11. Sources
  12. Frequently Asked Questions

Mibuna bolts readily in hot, dry weather, so it does best sown for a cool spell with consistently moist soil rather than during peak heat. Baby leaves reach 8–10cm tall about a month after sowing and are ready to start picking cut-and-come-again.

The short answer

Site
soil pH 6–7.5
Biggest risk
Club root

Core growing advice on this page is checked against named horticultural sources — see References.

Mibuna (Brassica rapa var. japonica)

Mibuna rosette of narrow, entire-margin leaves — “Mibuna” by Kingfiser is licensed under CC BY-SA 4.0.

1 sources cited · Single source

Quick Facts

Mibuna rosette of narrow, entire-margin leaves — “Mibuna” by Kingfiser is licensed under CC BY-SA 4.0.
“Mibuna” by Kingfiser is licensed under CC BY-SA 4.0.
Factor Value
Soil pH 6 - 7.5
Soil texture fork in compost or well-rotted manure (RHS)
Drainage well-drained
Lifecycle annual or biennial grown as an annual
Edible parts leaves
Documented problems 1 disease, 5 pests

At a Glance

A clump of Mibuna with reddish stem bases — “Brassica rapa subsp. japonica (Mibuna), clump with reddish stem bases (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF
“Brassica rapa subsp. japonica (Mibuna), clump with reddish stem bases (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF.
Brassica rapa var. japo… Mibuna Club root Cabbage caterpillars Flea beetles Pigeons Snails Slugs DISEASES PESTS

Diseases

Mibuna rosette of narrow, entire-margin leaves — “Mibuna” by Kingfiser is licensed under CC BY-SA 4.0.
“Mibuna” by Kingfiser is licensed under CC BY-SA 4.0.
moderate

Plasmodiophora brassicae

Likely rather than confirmed: no source names this crop directly, but it shares a species (Brassica rapa) with Mizuna, which is susceptible to this disease.

Pests

Mibuna growing with its distinctive narrow, smooth-edged leaves — “Brassica rapa subsp. japonica (Mibuna), growing rosette with narrow entire leaves (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF
“Brassica rapa subsp. japonica (Mibuna), growing rosette with narrow entire leaves (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF.
Cabbage caterpillars
moderate

Pieris brassicae; Pieris rapae; Pieris napi; Mamestra brassicae; Plutella xylostella

RHS names this directly: cabbage caterpillars.

Flea beetles
low

Chrysomelidae: Alticini (various spp.)

RHS names this directly: flea beetles, though damage is cosmetic only.

Pigeons
moderate

Columbidae (family)

RHS names this directly: pigeons.

Snails
low

Gastropoda (snails, various spp.)

RHS names this directly: snails.

Slugs
low

Gastropoda (slugs, various spp.)

RHS names this directly: slugs.

Soil & Growing Conditions

A clump of Mibuna with reddish stem bases — “Brassica rapa subsp. japonica (Mibuna), clump with reddish stem bases (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF
“Brassica rapa subsp. japonica (Mibuna), clump with reddish stem bases (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF.

Water: moist soil required to perform well (RHS)

Soil pH range

6 7.5

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

Mibuna and Mizuna leaves side by side, showing the difference in leaf shape — “Mibuna and Mizuna” by Kingfiser is licensed under CC BY-SA 4.0.
“Mibuna and Mizuna” by Kingfiser is licensed under CC BY-SA 4.0.
Stage BBCH Notes
Sowing 0 Sow 1cm deep in shallow drills, rows 23cm apart; germinates in about a week (RHS).
Thinning 1 Thin to 10-15cm for salad leaves, 20cm for larger leaves, 30-40cm for mature plants (RHS).
Leaf growth 3 Baby leaves reach 8-10cm tall about a month after sowing; keep soil moist to prevent bolting (RHS).
Cut-and-come-again harvest 8 Whole rosettes can be cut after 6-8 weeks, about 5cm above ground, to allow re-sprouting (RHS).

Harvest & Storage

A harvested bundle of Mibuna leaves with roots attached — “Brassica rapa subsp. japonica (Mibuna), harvested bundle with roots (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF
“Brassica rapa subsp. japonica (Mibuna), harvested bundle with roots (Barstow garden collection)” by Stephen Barstow is licensed under CC BY 4.0. Source: GBIF.

When to pick: Harvest baby leaves once 8-10cm tall, about a month after sowing, cut-and-come-again for repeated picking; or cut whole rosettes after 6-8 weeks about 5cm above ground to allow re-sprouting (RHS).

Plan your Mibunas planting

Timing for Mibunas follows soil temperature and frost, not the calendar date. The Global vegetable planting calendar explains the method. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.

Growing Mibuna in another region

Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.

Sources

The full list of 1 sources behind this guide (Royal Horticultural Society) is in the references of our UK guide to mibuna; they describe the plant itself, which is the same wherever it grows.

Frequently Asked Questions

What soil pH does mibuna need?

A pH of about 6–7.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

What problems affect mibuna?

Our data links 1 disease and 5 pests to this crop. See the sections above for each one and how to manage it.

Plan next season before the problems start

This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.

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SoilCommander Editorial Team — under the guidance of Nitin Sharma, Co-Founder

Every growing guide is checked against RHS, USDA Cooperative Extension, and other named horticultural authorities before publishing. How we check our facts.

How this guide is put together

The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against international horticultural research and extension sources. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.

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Last verified 2026-08-29

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