When to Plant Fennel (herb) in Cairns, Tropical Guide

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

Planting window
You might be able to grow it here under the right conditions. Sow in the dry season, April to July. Bulb fennel often struggles in tropical...
Days to harvest
60 days
Sunlight
Full sun.
Water needs
Low water needs once established. Water regularly when young. Very drought tolerant as a...
Spacing
30cm apart, 60cm between rows
Soil pH
5.5-7.0

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

This Fennel (herb) 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.

Fennel (herb)

Photo: Wikimedia Commons

Herb fennel (common fennel) is a tall, feathery perennial grown for its anise-flavoured leaves, stems and seeds. NOT the same as Florence/bulb fennel (F. vulgare var. azoricum). Herb fennel is hardy, drought-tolerant, and can become a large landscape plant reaching 1.5-2m. Considered a weed in parts of Australia, grow responsibly.

See what grows now in your own postcode

Planting Calendar for Tropical

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

S = Seed Tray   T = Transplant   D = Direct Sow

Want a nudge when it is Fennel (herb) sowing time in Cairns?

One email a week with what is worth planting in the Tropical zone right now, Fennel (herb) 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: 22.1°C (optimal range: 10–25°C) ✓ Ready to plant

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

What this month normally looks like

In October the Tropical zone normally runs 34°C by day and 23°C overnight, with about 53 mm of rain over 5 or 6 wet days. Averages 1991 to 2026, 37 postcodes, SILO.

How to Grow Fennel (herb) in Tropical Australia

When to Plant

You might be able to grow it here under the right conditions. Sow in the dry season, April to July. Bulb fennel often struggles in tropical heat; bulbs take 80 to 90 days, and leaves can be picked earlier.

Soil
Any well-drained soil. Tolerant of poor soils. Drought tolerant once established.
pH Range
5.5-7.0
Sunlight
Full sun.
Spacing
30cm apart, 60cm between rows
Watering
Low water needs once established. Water regularly when young. Very drought tolerant as a perennial.

Companion plants: Dill (distant), Sage

Avoid planting near: Tomato, Bean, Capsicum, Coriander, fennel is allelopathic and inhibits growth of many vegetables

Tropical Growing Tips for Fennel (herb)

Recommended Varieties

  • Common/wild fennel
  • Bronze fennel (ornamental variety)

Key Challenges

  • Humidity and wet feet
  • Root rot risk in wet season

Pro Tips

  • Raise beds for drainage
  • Choose driest, sunniest spot
  • May behave as annual in tropics

Harvesting Fennel (herb)

When ready: Harvest leaves anytime once plant is established. Seeds ready when brown on plant.

How to harvest: Snip feathery fronds as needed. Cut seed heads when brown and dry in paper bags. Harvest young stems for cooking.

Where to next

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

Also worth sowing in the tropical zone this October: Ginger, Lemongrass, Basil and Okra.

Get the Full Interactive Guide

Track your garden, get real-time pest alerts, and plan around your zone's weather.

Open the planting dashboard Join GardenBuddy.au

Common Questions About Fennel (herb)

When do you plant fennel in Australia?

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

Does fennel grow all year round in Cairns?

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