When to plant Lavender in Tropical Australia

Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.

Lavender is sown from September to November in the tropics — raise seedlings in trays and transplant — but be honest about the odds: English lavender is a Mediterranean plant, and the coastal humidity from Townsville down to Mackay is close to its worst-case scenario. Seed is slow, taking 18–28 days to germinate from a shallow 3 mm sowing, and plants need about a year to reach maturity, meaning every tropical lavender must survive at least one full wet season. The growers who succeed almost all do it in pots with sharp drainage; in-ground spacing is 50–70 cm, but containers are the realistic default here.

Sowing calendar — tropical zone

Green months are your sowing window: September to November.

Growing notes

The sowing window looks perverse at first — September to November puts your youngest, most vulnerable plants straight into the build-up and then the monsoon. That is exactly why container growing dominates in the tropical zone: an unglazed terracotta pot with a gritty, fast-draining mix (cut in about a third coarse sand or perlite) can move under a verandah or wide eave from December to April, out of the rain but still in full sun. In-ground lavender in Cairns or Mackay generally dies in its first wet season.

The failure mode is always the same: a healthy-looking plant collapses over a few days, grey and limp, killed by root and crown rot in warm, saturated soil. Prevention is the only treatment — water just when the mix is dry a knuckle deep, never overhead, and use a gravel mulch rather than an organic one that holds moisture against the stem.

• Full sun, at least six hours, with open airflow on all sides
• A little lime or dolomite if your mix runs acid
• Prune lightly after flowering; never cut into bare wood
• Raise pots on feet so drainage holes never sit in water

With roughly a year to maturity, a spring sowing flowers properly in its second dry season — treat the first year simply as keeping the plant alive.

Lavender at a glance

Common questions

When should I sow lavender in tropical Australia?

Sow September to November in trays, then transplant. Germination takes 18–28 days and plants need around a year to mature, so expect the first real flowering in the second dry season.

Why did my lavender suddenly die?

Almost certainly root or crown rot from warm, wet soil — the classic tropical lavender failure. Grow in a free-draining pot, water only when the mix is dry a knuckle deep, and shelter it from monsoon rain.

Can lavender survive the wet season in Townsville?

In the ground, rarely. In an unglazed terracotta pot with gritty mix, moved under a verandah from December to April, it has a genuine chance.

Is lavender worth growing in the tropics at all?

It is a challenge crop rather than a reliable one. Treat it as a container plant, accept that humidity is the enemy, and it can be done — but easier aromatic herbs will give more return.

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