When to Plant Mizuna in Cairns — Tropical Guide

Mizuna

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.

Current Growing Conditions

Soil temperature: 25.2°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.

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