When to Plant Garlic in Cairns, Tropical Guide

Sow April to June. 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 Garlic 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.

Garlic

Photo: Wikimedia Commons

Garlic is one of the most rewarding crops for Australian home gardeners. Plant cloves in autumn, harvest in summer. It practically grows itself. Variety selection is critical: softneck types for warm climates, hardneck for cold. Subtropical-specific varieties exist for northern growers. Home-grown garlic is vastly superior to imported Chinese garlic that dominates supermarket shelves.

Planting Calendar for Tropical

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
- - - D D D - - - - - -

S = Seed Tray   T = Transplant   D = Direct Sow

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

One email a week with what is worth planting in the Tropical zone right now, Garlic 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: 5–20°C) ✗ Outside optimal range

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

How to Grow Garlic in Tropical Australia

When to Plant

February to mid-March. Subtropical varieties ONLY - standard garlic will not bulb in tropical conditions. These day-length neutral varieties do not require cold for bulb initiation.

Soil
Well-drained, fertile sandy loam enriched with aged compost. Garlic absolutely demands good drainage. Waterlogged soil causes bulb rot. Raised beds ideal in heavy clay areas. Do not add fresh manure at planting time.
pH Range
6.0-7.0
Sunlight
Full sun (6+ hours). No shade tolerance. Garlic needs maximum sun for bulb development.
Spacing
15cm apart, 25cm between rows
Watering
Water regularly during active growth (autumn-spring) but reduce watering as leaves begin to yellow in late spring/summer. Stop watering 2-3 weeks before harvest. Wet soil at harvest causes storage rot

Companion plants: Rose, Tomato, Beetroot, Lettuce, Chamomile, Strawberry

Avoid planting near: Peas, Beans, Asparagus, Sage

Tropical Growing Tips for Garlic

Recommended Varieties

  • Glenlarge (Subtropical)
  • Southern Glen (Subtropical)
  • Italian Pink (Subtropical)

Key Challenges

  • Standard garlic varieties will NOT bulb in tropical zones
  • Fungal diseases in humid conditions
  • Thrips and aphids year-round
  • Limited variety selection

Pro Tips

  • ONLY plant subtropical group varieties (Glenlarge, Southern Glen, Italian Pink, Italian Red)
  • These are day-length neutral. They bulb based on maturity, not day length
  • Plant late February-mid March for harvest in August-September

Harvesting Garlic

When ready: Bottom 3-4 leaves brown and dried, top 4-5 leaves still green. This typically indicates 5-7 bulb wrappers remain (each green leaf = one wrapper). Do not wait until all leaves die. Bulb wrappers deteriorate and bulbs split open. Dig one test bulb to check. Cloves should fill the wrapper tightly with clear clove differentiation.

How to harvest: Loosen soil alongside row with garden fork, then gently lift bulbs. Do NOT pull by the stalk, it may break. Brush off loose soil but do not wash. Cure in a dry, shaded, well-ventilated area for 2-4 weeks until outer wrappers are papery and stems are dry. Trim roots and stalks after curing (or braid softneck types).

Where to next

What garlic 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 garlic: Rust (various).

Supermarket Price

Current average retail: $31.50/kg (12-month range: $29.99–$35.01)

Grow your own and save on grocery bills.

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Common Questions About Garlic

When do you plant garlic in Australia?

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

Does garlic grow all year round in Cairns?

No. In the Tropical zone the planting months are Apr to Jun. 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.