When to Plant Spinach in Sydney — Warm Temperate Guide

Spinach

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: 19.3°C (optimal range: 4–25°C) ✓ Ready to plant

How to Grow Spinach in Warm Temperate Australia

When to Plant

February-May (autumn) and August-September (late winter). Autumn sowing most reliable. Bolts in warm spring weather.

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)

Warm Temperate Growing Tips for Spinach

Recommended Varieties

  • Bloomsdale Long Standing
  • Winter Giant
  • Viroflay
  • Baby Spinach varieties
  • Matador

Key Challenges

  • Spring bolting as days lengthen
  • Downy mildew in cool wet spells

Pro Tips

  • Autumn sowing (March-April) is the most reliable for Sydney
  • Choose bolt-resistant varieties for late-season plantings
  • Part shade significantly extends the productive window

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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