When to Plant Broccoli in Cairns, Tropical Guide

Sow April to July. Right now in September it is out of season. The next sowing month is April.

Published · Last reviewed · By Garden Buddy
Growing advice is reviewed by hand. Planting dates, current conditions and prices on this page update daily.

This Broccoli guide is written for the Tropical zone, which takes in Cairns, Townsville and Darwin. Somewhere else? Your postcode picks the right one.

Not your zone? Brisbane Sydney Melbourne Canberra Alice Springs Perth

Also handy: will it frost this week? and what grows in shade.

Broccoli

Photo: Wikimedia Commons

Broccoli is a cool-season brassica that produces a large central head followed by smaller side-shoots over several weeks. It is one of the most nutritious vegetables available and grows well across most Australian zones during the cooler months. The key to success is timing (avoiding heat-induced bolting) and managing the ever-present Cabbage White Butterfly.

Planting Calendar for Tropical

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
- - - S S/T T T - - - - -

S = Seed Tray   T = Transplant   D = Direct Sow

Want a nudge when it is Broccoli sowing time in Cairns?

One email a week with what is worth planting in the Tropical zone right now, Broccoli included, plus which veg has jumped in price at the supermarket. Free, and you can stop it in one click.

Current Growing Conditions

Soil temperature: 21.4°C (optimal range: 10–30°C) ✓ Ready to plant

Modelled from Open-Meteo forecast (Cairns), not a live sensor.

How to Grow Broccoli in Tropical Australia

When to Plant

March-July only (dry season/winter). Summer planting will bolt. Transplant seedlings started 5-6 weeks earlier.

Soil
Rich, moisture-retentive loam with plenty of compost and well-rotted manure. Firm soil preferred. Brassicas dislike loose, fluffy beds.
pH Range
6.0-7.0
Sunlight
Full sun (minimum 6 hours). Tolerates partial afternoon shade in warmer zones.
Spacing
45cm apart, 60cm between rows
Watering
Consistent deep watering 2-3 times weekly. Brassicas are shallow-rooted and stress quickly in dry conditions. Inconsistent watering causes hollow stems and poor head formation. Drip irrigation or soak

Companion plants: Celery, Onion, Chamomile, Dill, Rosemary, Sage

Avoid planting near: Strawberry, Tomato, Capsicum, Other brassicas (rotation)

Tropical Growing Tips for Broccoli

Recommended Varieties

  • Green Magic (heat-tolerant hybrid)
  • Summer Green
  • Belstar
  • Marathon

Key Challenges

  • Heat causes premature bolting
  • Intense caterpillar pressure year-round
  • Humidity drives fungal diseases
  • Short suitable growing window

Pro Tips

  • Choose heat-tolerant hybrids only. Heritage varieties will bolt
  • Exclusion netting is mandatory, not optional
  • Grow fast, transplant strong seedlings for quickest maturity

Harvesting Broccoli

When ready: Central head should be 10-15cm diameter with tight, dark green buds. Harvest BEFORE any yellow flowers appear. Individual buds should be compact and firm, not swollen or loose.

How to harvest: Cut main head with 10-15cm of stem attached using a sharp knife, cutting at an angle to shed water from the cut surface. LEAVE THE PLANT IN THE GROUND - side shoots will develop from leaf axils and produce smaller broccoli heads for 4-8 weeks after main head harvest.

Worth growing?

A 2.4 m × 1.2 m bed fits 6 plants, about $15 worth at today’s Aldi and Coles prices, checked today.

That is roughly 3 kg at $5.00 a kilo.

Draw your broccoli bed → No account needed.

Where to next

What broccoli costs in the shops right now, retailer by retailer, updated daily.

Also worth sowing in the tropical zone this September: Lemongrass, Ginger, Cucumber and Basil.

The pest most likely to find your broccoli: Cabbage White Butterfly.

Supermarket Price

Current average retail: $5.00/kg (12-month range: $3.49–$7.90)

Grow your own and save on grocery bills.

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Common Questions About Broccoli

When do you plant broccoli in Australia?

It depends on your climate zone, not the calendar month alone. Planting months by zone:

Does broccoli grow all year round in Cairns?

No. In the Tropical zone the planting months are Apr to Jul. Outside that window it either bolts, sulks or gets cut down by the weather.

Which zone am I in?

Type your postcode into the box under the heading and the page tells you, and links this crop in your own zone if it differs. Or look it up on the grow zone map. This page is the Tropical zone, Cairns is its reference city.