When to Plant Leek in Brisbane — Subtropical Guide

Leek

Photo: Wikimedia Commons

Leeks are the gentle giant of the allium family - milder than onions, easier than garlic, and more cold-hardy than both. They occupy the garden for a long time (5-6 months from seed) but require minimal attention once established. Excellent for cool-season gardens and highly adaptable across Australian zones. A staple of winter soups, gratins, and quiches.

Current Growing Conditions

Soil temperature: 23.6°C (optimal range: 13–24°C) ✓ Ready to plant

How to Grow Leek in Subtropical Australia

When to Plant

Sow March to August. Transplant April to September. Harvest July to November. SEQ's mild winters produce good leeks.

Soil
Rich, well-drained soil with plenty of organic matter. Leeks are heavy feeders that benefit from deeply dug beds with generous compost and aged manure. Prefer neutral to slightly alkaline soil. Add lime to acidic soils.
pH Range
6.5-7.5
Sunlight
Full sun (6+ hours). Tolerates partial shade better than most alliums, but stems will be thinner in shade.
Spacing
15cm apart, 40cm between rows
Watering
Consistent moisture throughout growth. Water deeply once or twice per week. Leeks are more drought-tolerant than onions but produce thicker stems with consistent water. Reduce watering slightly in win

Companion plants: Carrot, Celery, Onion, Strawberry, Beetroot

Avoid planting near: Beans, Peas

Subtropical Growing Tips for Leek

Recommended Varieties

  • King Richard
  • Musselburgh
  • Perpetual Leek

Key Challenges

  • Summer heat if planted late
  • Rust in humid conditions
  • Thrips

Pro Tips

  • Start seed in March-April, transplant into dibbled holes in May-June
  • Perpetual leeks thrive in SEQ - divide clumps every year for a continuous supply
  • Blanch by mounding soil or mulch up the stem progressively

Harvesting Leek

When ready: Stems are at least 2cm diameter (pencil-thick minimum, but 3-5cm is better). Can be harvested at any size from baby leeks (1cm diameter, 10 weeks) to full-size (5cm+, 5-6 months). No rush - leeks hold well in the ground.

How to harvest: Loosen soil alongside the leek with a garden fork, then lever out. Do not pull straight up - the stem may snap. Trim roots and damaged outer leaves. Wash thoroughly between sheaths (soil and insects hide in the layers).

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