When to Plant Mizuna in Cairns — Tropical Guide
Photo: Wikimedia Commons
Mizuna is a fast-growing Japanese mustard green with distinctive feathery, serrated leaves and a mild, slightly peppery flavour. It is one of the easiest and fastest Asian greens to grow, ready to harvest as baby leaf in 3-4 weeks. More bolt-resistant than many Asian greens, it can be grown year-round in most Australian zones with successive sowings.
Planting Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| — | — | — | S | S/T/D | S/T/D | T | — | — | — | — | — |
S = Seed Tray T = Transplant D = Direct Sow
Current Growing Conditions
Soil temperature: 19.6°C (optimal range: 10–30°C) ✓ Ready to plant
How to Grow Mizuna in Tropical Australia
When to Plant
March-August (dry season). More bolt-resistant than most Asian greens. Quick crop means it can sneak in a harvest even in marginal conditions.
- Soil
- Well-drained, fertile soil enriched with compost. Not fussy about soil type but performs best in loose, moisture-retentive ground.
- pH Range
- 6.0-7.5
- Sunlight
- Full sun in cool weather. Part shade (afternoon) in warm weather to prevent bolting and bitterness.
- Spacing
- 25cm apart, 30cm between rows
- Watering
- Keep consistently moist. Light, frequent watering suits shallow roots. Drought stress triggers bolting and bitterness. Drip or soaker hose ideal.
Companion plants: Lettuce, Radish, Carrot, Peas, Beans
Avoid planting near: Other brassicas if disease is present
Tropical Growing Tips for Mizuna
Recommended Varieties
- Standard green mizuna
- Purple mizuna (slightly more bolt-resistant)
Key Challenges
- Flea beetles in warm weather
- Bolts if day-length exceeds 13 hours
- Fungal issues in wet season
Pro Tips
- One of the best quick-crop Asian greens for tropical gardens
- Harvest as baby leaf in 3-4 weeks before bolting
- Succession sow every 2 weeks through dry season
Harvesting Mizuna
When ready: Baby leaf: 10-15cm tall (3-4 weeks). Full size: 30-40cm (5-7 weeks). Leaves should be bright green, fresh, and tender.
How to harvest: Cut-and-come-again: cut leaves 3cm above ground level and they will regrow 2-3 times. Or harvest individual outer leaves. Or pull entire plant for one large harvest.
Common Mizuna Pests in Tropical Zones
Organic prevention: Row covers from sowing. Maintain moist soil (flea beetles prefer dry conditions). Delay autumn sowing until cooler weather reduces beetle activity.
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