When to Plant Spinach in Brisbane — Subtropical Guide
Photo: Wikimedia Commons
True spinach (English spinach) is a cool-season annual prized for its tender, dark green leaves. It is one of the most nutritious leafy greens but also one of the most temperamental to grow in Australian conditions. It bolts rapidly in heat and long day-lengths, making it primarily an autumn-winter-early spring crop across most of Australia. Understanding this limitation is key to successful growing.
Current Growing Conditions
Soil temperature: 23.6°C (optimal range: 4–25°C) ✓ Ready to plant
How to Grow Spinach in Subtropical Australia
When to Plant
March-August. Peak sowing April-June. Bolts from August onwards. Short productive window of 4-6 weeks per sowing.
- Soil
- Rich, well-drained soil heavily enriched with compost and well-rotted manure. Spinach is a heavy feeder that demands fertile soil.
- pH Range
- 6.0-7.5
- Sunlight
- Full sun in cool weather. Part shade beneficial in all but the coldest zones. Shade delays bolting.
- Spacing
- 20cm apart, 30cm between rows
- Watering
- Consistent moisture essential. Light, frequent watering keeps soil evenly moist. Drought stress triggers bolting. Morning watering. Drip irrigation ideal.
Companion plants: Strawberry, Pea, Bean, Celery, Cauliflower, Radish
Avoid planting near: Beetroot (same family; shared pests and diseases)
Subtropical Growing Tips for Spinach
Recommended Varieties
- Bloomsdale Long Standing (bolt-resistant)
- Winter Giant
- Baby Spinach varieties
- Perpetual Spinach (actually a silverbeet, but marketed as spinach)
Key Challenges
- Very narrow growing window
- Bolts from August-September as days lengthen
- Downy mildew in humid winter weather
Pro Tips
- Succession sow every 2 weeks from March for continuous supply through winter
- Bloomsdale Long Standing is the best bolt-resistant variety for SEQ
- Perpetual Spinach (actually Beta vulgaris, a silverbeet) is far more reliable year-round
Harvesting Spinach
When ready: Baby spinach: leaves 5-8cm (3-4 weeks). Full size: leaves 15-20cm (6-8 weeks). Leaves should be dark green, firm, and glossy. Harvest before any sign of flower stalk elongation.
How to harvest: Cut-and-come-again: cut outer leaves at base, leaving inner leaves and growing point. Or cut entire plant 3cm above ground for one large harvest (may regrow once). Harvest in cool of morning.
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