When to plant Pea in Tropical Australia

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

Sow peas direct from March to June, pushing seed 20–30 mm deep into the cooling soil of the early-to-mid dry season. Peas are a cool-weather crop, so in the tropics this narrow window across Cairns, Townsville and Mackay is the only realistic time to grow them. Seed germinates in 8–16 days, and plants reach picking size in 65–90 days. Space seeds 5–10 cm apart in rows 40–60 cm apart, and give climbing types a trellis. Because they resent heat, an early sowing gives the best chance of a crop before temperatures climb again.

Sowing calendar — tropical zone

Green months are your sowing window: March to June.

Growing notes

Peas are pushing their luck in the tropics, but a dry-season sowing can work if you get the timing right. They want cool nights and mild days, both of which the mid-dry season offers. Sow into a sunny, well-drained bed and provide support for taller varieties, as good airflow up a trellis helps ward off disease.

The main failure mode is heat and humidity. Sow too early or too late and plants either refuse to set pods in the warmth or fall to powdery mildew, which is common on peas in humid conditions. If you see the tell-tale white bloom on leaves, improve airflow, water at the base only, and remove badly affected growth. Choosing quicker maturing varieties reduces the risk of running into hot weather.

A few tips to lift your odds:

• Do not soak the seed, as pre-soaked peas can rot in warm, moist soil.
• Inoculating with rhizobia is optional but helps in beds that have not grown legumes before.
• Pick pods regularly to keep the plants productive across their short season.

Accept that a tropical pea season is short and somewhat marginal. Treat a good crop as a bonus of the coolest weeks of the year.

Pea at a glance

Common questions

When can I plant peas in Cairns?

Sow direct from March to June, during the cooler, drier part of the year. Peas will not tolerate the heat and humidity of the wet season, so this early-to-mid dry-season window is essential. Sowing early in that range gives the best chance of a full crop.

Why do my peas get white powdery leaves?

That is powdery mildew, which thrives on peas in humid tropical air. Improve airflow with a trellis, water only at the base to keep foliage dry, and remove badly affected growth. Growing quick-maturing varieties helps you finish before conditions worsen.

How deep should I sow pea seed?

Sow peas 20 to 30 mm deep into moist, well-drained soil. Avoid pre-soaking the seed in the tropics, since soaked peas can rot in warm ground. They germinate in 8 to 16 days.

Can peas grow in the tropics at all?

Yes, but only marginally and only in the cool dry season from March to June. They are a cool-climate crop, so expect a shorter, less reliable season than gardeners get further south. A good harvest is a reward for sowing at exactly the right time.

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