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How to Grow Mibunas UK | Regional Planting Calendar
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RHS: outdoor sowing March to August, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
Midlands - detail & sources
RHS: outdoor sowing March to August, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
Northern England - detail & sources
RHS: outdoor sowing March to August, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
Scotland - detail & sources
RHS: outdoor sowing March to August, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
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).
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.
RHS treats Mibuna and Mizuna as genuinely distinct named varieties -- Mizuna's leaves are more deeply lobed and feathery by comparison, visible side by side here.
RHS: harvest baby leaves once 8-10cm tall for cut-and-come-again pickings, or take whole rosettes after 6-8 weeks, cutting 5cm above ground to allow re-sprouting.
Mibuna forms larger, denser clumps of narrower, dark green, smooth-edged leaves with a light mustard flavour, distinct from Mizuna's more deeply lobed leaves -- suitable for salads or light cooking. Grows best in cool, damp weather of spring and autumn, tolerates semi-shade, requires moist soil; container minimum 30cm wide. Soil prep: fork in compost or well-rotted manure to retain moisture, tread and rake to fine texture. Sow 1cm deep in shallow drills, rows 23cm apart, plants thinned to 10-15cm for salad leaves, 20cm for larger leaves, 30-40cm for mature plants; germinates in about a week; outdoor sowing March-August. Harvest baby leaves once 8-10cm tall (about a month); cut-and-come-again for multiple pickings, or harvest whole rosettes after 6-8 weeks, cutting 5cm above ground for re-sprouting. Bolts in hot, dry conditions. Pests: slugs, snails, flea beetles (cosmetic damage), cabbage caterpillars, pigeons. Prevention: keep soil moist, mulch, insect-proof mesh, regular weeding.
1 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
When should I sow mibunas in the UK?
In Southern England, from early March. In Scotland, wait until early March. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow mibunas?
Sow early March to late August.
What soil pH do mibunas 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 mibunas?
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
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
UK vegetable growing guides · Checked against RHS & Met Office guidance
Every SoilCommander guide is written and maintained by our editorial team for real UK growing conditions, and reviewed against Royal Horticultural Society growing advice and Met Office climate data before publication.
Sketch your exact plot shape, pick your UK crops, and get a spacing-accurate bed layout with companion pairings, a rotation plan and month-by-month sowing dates — every fact sourced from RHS and Garden Organic.
