How to Grow Mizuna
Brassica rapa var. nipposinica
When to Start
Direct sow outdoors as soon as soil reaches 6°C — typically early to mid spring. Can also be started indoors 3 weeks earlier for a head start.
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Growth Stages
Approximate days from start
Care Essentials
- Light liquid feed every 2 weeks. Needs consistent moisture.
- Fast-growing Asian green. Mild, peppery flavour. Sow from spring to autumn for year-round supply.
Companion Planting
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Growing Conditions
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- Sow indoors
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- Transplant out
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- First harvest
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Spacing & Planting
| Plant spacing | 20 cm |
| Row spacing | 30 cm |
| Sow depth | 0.5 cm |
| Mature height | 30 cm |
| Mature spread | 25 cm |
A fast-growing Japanese green. Can be harvested as a 'cut-and-come-again' crop when sown more densely.
Care Guide
- Feeding
- Light liquid feed every 2 weeks. Needs consistent moisture.
- Watch for
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- Flea beetle
- Slugs
- Bolting in heat
Pests & Diseases
Pest Flea Beetle
Identification: Tiny round shot-holes peppered across leaves, small shiny black beetles that jump when disturbed
- Cover with fine insect mesh from sowing
- Water regularly to encourage fast growth through vulnerable stage
- Sticky yellow traps placed near plants
- Pyrethrum-based spray as a last resort
Pest Slugs and Snails
Identification: Irregular holes in leaves, seedlings eaten overnight, slime trails on soil and foliage
- Beer traps near rows
- Nematode biological control (Nemaslug)
- Evening hand-picking
- Ferric phosphate pellets (wildlife-safe)
Pest Cabbage White Caterpillars
Identification: Ragged holes in leaves, green or yellow-black caterpillars, clusters of yellow eggs on leaf undersides
- Cover with insect mesh
- Hand-pick caterpillars and eggs
- Bacillus thuringiensis (Bt) spray
- Limited options for edible crops
Disease Downy Mildew Hyaloperonospora parasitica
Symptoms: Yellow patches on upper leaf surfaces, grey-white fuzzy growth underneath, leaves brown and collapse
Treatment: Remove affected leaves. Improve air circulation.
Prevention: Space plants well. Avoid overhead watering. Ensure good drainage. Rotate brassica crops.
Disease White Blister Albugo candida
Symptoms: Raised white blistery pustules on leaf undersides, corresponding yellow patches on upper surfaces
Treatment: Remove affected leaves. Plants usually recover if infection is mild.
Prevention: Space plants for airflow. Avoid overhead watering. Rotate brassica crops on a 3-year cycle.
Growing Conditions
| Min. soil temperature | 6°C |
| Germination temperature | 10–20°C |
| Base growth temperature | 4°C |
| Min. daylength to start | 9h |
| Photoperiod sensitivity | long day |
Frequently Asked Questions
- How far apart should I plant Mizuna?
- Plant Mizuna 20cm apart with 30cm between rows.
- When can I harvest Mizuna?
- Mizuna is ready to harvest approximately 30 days after transplanting.
- Is Mizuna frost hardy?
- Mizuna is classified as Hardy.
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