When to Plant Jerusalem Artichoke in Cairns, Tropical Guide

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

Also called sunchoke, sunroot.

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

This Jerusalem Artichoke 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.

Jerusalem Artichoke

Photo: Wikimedia Commons

Jerusalem artichokes (sunchokes) are one of the easiest and most productive root vegetables for Australian gardens. A perennial sunflower relative that produces knobby, nutty-flavoured tubers underground. Virtually indestructible once established, producing heavy crops with almost zero maintenance. The catch: they are notoriously invasive, and the inulin they contain causes flatulence in many people. Plan your planting site carefully.

Planting Calendar for Tropical

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

S = Seed Tray   T = Transplant   D = Direct Sow

February to April (after wet season peak). Jerusalem artichokes need at least 140 frost-free days and a period of shortening day length to trigger tuber formation. Tropical zones provide this but extreme heat may reduce yield.

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Current Growing Conditions

Soil temperature: 21.4°C (optimal range: 6–25°C) ✓ Ready to plant

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

How to Grow Jerusalem Artichoke in Tropical Australia

When to Plant

February to April (after wet season peak). Jerusalem artichokes need at least 140 frost-free days and a period of shortening day length to trigger tuber formation. Tropical zones provide this but extreme heat may reduce yield.

Soil
Tolerates almost any soil but produces best tubers in loose, well-drained soil with moderate organic matter. Thrives in sandy loam to clay loam. Grows in poor soils where other crops fail. Deep soil produces larger tubers.
pH Range
5.8-7.5
Sunlight
Full sun (6+ hours). Tolerates partial shade but tuber production is reduced. Plants grow 2-3m tall and can shade other crops.
Spacing
35cm apart, 60cm between rows
Watering
Drought tolerant once established. Water regularly during tuber formation (summer-autumn) for larger yields. Weekly deep watering in dry spells. Overwatering is rarely an issue.

Companion plants: Corn (similar height/culture), Sunflower, Pumpkin

Avoid planting near: Low-growing crops that will be shaded (lettuce, strawberry)

Tropical Growing Tips for Jerusalem Artichoke

Recommended Varieties

  • Fuseau (smoother tubers)
  • Common (knobby but productive)

Key Challenges

  • Excessive rain causing stem rot
  • Heat stress reducing tuber size
  • Plants may not trigger tuber formation without cool conditions

Pro Tips

  • Marginal in true tropical zones. Tuber formation is triggered by shortening days and cool weather
  • Plant in the drier months and harvest before the next wet season
  • Raised beds essential for drainage

Harvesting Jerusalem Artichoke

When ready: Harvest after the stems die back from frost or natural senescence (usually May-June). Tubers are mature when plants have flowered and tops begin to yellow. Approximately 140-150 days from planting.

How to harvest: Cut dead stems to 10cm. Dig carefully with a garden fork, starting well outside the stem base. Tubers spread laterally up to 40cm from the main stem. Any tuber left in the ground WILL regrow. Harvest thoroughly if you want to contain the patch.

Where to next

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

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Common Questions About Jerusalem Artichoke

When do you plant jerusalem artichoke in Australia?

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

Does jerusalem artichoke grow all year round in Cairns?

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

What else is jerusalem artichoke called?

Jerusalem artichoke is the usual Australian name. Overseas seed packets and recipes call it sunchoke, sunroot. Same plant, same growing advice.

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.