When to plant Lettuce in Temperate Australia

Temperate zone — applies to Sydney, Melbourne, Adelaide, Perth, Newcastle and similar areas. Growing elsewhere? Cool · Subtropical · Tropical · Arid.

Lettuce can be sown direct in every month of the year in temperate Australia — it is one of the few genuinely year-round crops in this climate. Sow seed 5 mm deep, thin to 20–30 cm each way, and expect seedlings within 6–12 days and hearts or full heads in 60–90 days, with loose-leaf types pickable much sooner. Being hardy, it grows through winter frosts without protection; summer is actually its harder season. The real trick is succession sowing — a short row every two to three weeks beats one big bed that matures all at once.

Sowing calendar — temperate zone

Green months are your sowing window: January to December.

Growing notes

A hardy vegetable in a temperate climate, lettuce treats the frost calendar with indifference: sowings from May through winter grow slowly but surely, and frost rarely does more than mark outer leaves. The seasonal challenge is reversed from most crops. Summer heat is what ruins lettuce, in two ways — hot soil above roughly 25°C sends the seed dormant so germination fails, and heat pushes mature plants to bolt, stretching skyward and turning bitter. In the warm months, sow in the cool of the evening into shaded, moist soil, choose heat-tolerant loose-leaf varieties, and give beds afternoon shade.

Lettuce is shallow-rooted and mostly water, so it wants fertile soil with plenty of organic matter and light, frequent watering rather than occasional soakings. Any check to growth — dryness, heat, transplant shock — shows up as toughness, bitterness or bolting, so the aim is quick, uninterrupted growth from sowing to salad.

A few habits make a year-round supply realistic:

• Sow a short row every 2–3 weeks rather than a whole packet at once
• Switch varieties with the seasons — crisp hearting types for the cool months, heat-tolerant leaf types for summer
• Pick outer leaves from loose-leaf types to keep plants producing
• Protect seedlings from slugs and snails, which can level a freshly emerged row overnight

Lettuce at a glance

Companion planting

Grows well with

Peas: Peas fix nitrogen for lettuce; provide light shade in summer

Carrot: Carrots loosen soil; lettuce shades soil keeping it moist

Radish: Classic pairing — radish harvested before lettuce needs space

Common questions

Can I grow lettuce in winter in Australia?

Yes — in temperate Australia lettuce can be sown direct in any month, and being hardy it grows through winter frosts without cover. Growth is slower in the cold, so allow toward the top of its 60–90 day range.

How long does lettuce take to grow?

Seedlings appear in 6–12 days and full heads take 60–90 days, though loose-leaf varieties can be picked leaf by leaf from around a month. Regular sowings every few weeks give a continuous supply.

Why is my lettuce bolting?

Bolting — the plant shooting up a flower stalk and turning bitter — is triggered by heat and dry spells. Keep water consistent, grow summer lettuce in afternoon shade, and harvest promptly once heads mature.

Why won't my lettuce seed germinate in summer?

Lettuce seed goes dormant in hot soil, roughly above 25°C, so midsummer sowings often fail in full sun. Sow in the evening into moist, shaded soil, or raise seedlings somewhere cool and transplant.

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