Onion
Allium cepa
When to plant onion in Australia
Plant onion February to May in temperate climates (Melbourne, Adelaide, Sydney); January to March in cool climates (Canberra, Hobart, Ballarat); April to June in subtropical climates (Brisbane, Gold Coast); May to July in tropical climates (Darwin, Cairns); April to June in arid climates (Alice Springs, Mildura).
Can be grown from seed, seedlings, or sets (small bulbs — easiest). Harvest when foliage flops over and yellows. Cure in a dry airy spot for 2 weeks before storage.
Growing guide
Sunlight
4–6 hours direct sun per day
Watering
Low — drought tolerant once established
Spacing
10cm between plants, 30cm between rows
Frost tolerance
Hardy — tolerates frost
Frequently asked
- How long does onion take to grow in Australia?
- Onion takes 100–150 days from sowing to harvest, depending on variety and climate.
- How much space does onion need?
- Space onion 10cm apart in rows 30cm apart. Each plant needs 4–6 hours of sun per day.
- Can I grow onion in Melbourne in winter?
- Onion is generally not planted in Melbourne over winter. The temperate planting window is February to May.
- What should I plant next to onion?
- Companion plants for onion vary by garden conditions. Add onion to your patch in My Veggie Patch to see personalised companion recommendations.
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