When to Plant Rhubarb in Cairns, Tropical Guide

Not recommended for the Tropical zone

Soil temperature is modelled from Open-Meteo forecast (Cairns), not a live sensor.

What this month normally looks like in Tropical

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.

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  1. Planting calendar
  2. How to grow
  3. Local tips and varieties
  4. Pests and problems
  5. Harvesting
  6. Storing and preserving
  7. Other zones and related crops
  8. Common questions

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This Rhubarb 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.

Days to harvest
about 52 weeks
Sun
Full sun to part shade
Water
Regular
Spacing
90 cm apart
Soil pH
5.5–6.8

Rhubarb is a cold-climate perennial grown for its tart, colourful stalks used in pies, crumbles, jams, and sauces.

Published · By GardenBuddy.au
Planting dates, current conditions and prices on this page update daily.

Rhubarb

Photo: Wikimedia Commons

Best Planting Window for Tropical

Rhubarb is not recommended for Tropical.

NOT RECOMMENDED. Rhubarb requires winter chill to break dormancy and produce vigorous spring growth. Tropical zones do not provide this. Plants will be weak, leggy, and short-lived if they survive at all.

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How to Grow Rhubarb in Tropical Australia

Soil
Deep, rich, well-drained soil loaded with compost and aged manure. Rhubarb is an extremely heavy feeder. Dig in generous amounts of organic matter before planting.
Salt
Sensitive. Struggles with salty bore water or salty soil. Give it rainwater if you can.
pH Range
5.5-6.8
Sunlight
Full sun in cool climates. Afternoon shade essential in warm-temperate and marginal zones. 4-6 hours minimum.
Spacing
90cm apart, 120cm between rows
Watering
Deep watering weekly during active growth (spring-autumn). Reduce to minimal in winter dormancy. Consistent moisture prevents stringy stalks. Drought stress causes thin, tough stalks.
Good companions
Onion, Cabbage, Strawberry, Broccoli, Kale
Keep away from
Dock (related weed, harbours pests), Rampant ground covers that compete

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Tropical Growing Tips for Rhubarb

Key Challenges

  • No winter chill period for dormancy
  • Extreme humidity causes crown rot
  • Heat stress year-round
  • Plants will not thrive or produce worthwhile stalks

Pro Tips

  • Be honest with yourself: rhubarb will not succeed in tropical Australia
  • If you must try, treat as annual, grow from seed in the dry season, and expect disappointment
  • Consider alternatives like rosella (Hibiscus sabdariffa) which provides similar tartness in tropical climates

Pests and problems for Rhubarb in Tropical

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Browse the full pest library →

Harvesting Rhubarb

When ready: Stalks 25-40cm long, firm, and well-coloured (red, green, or pink depending on variety). Leaves fully unfurled. Stalks should snap cleanly when pulled.

How to harvest: PULL, do not cut. Grip stalk firmly at base and twist-pull outward with a slight twisting motion. Cutting leaves stubs that can rot and introduce disease to the crown. Remove leaf blade immediately (TOXIC - compost the leaves or discard, they are safe in compost). Never harvest more than one-third of stalks at once.

Storing and preserving rhubarb

How to keep it
  • Freezing (raw or stewed). Wash stalks, chop into 2-3cm pieces. Either freeze raw on a tray then bag (best for crumbles/pies), or stew with minimal sugar first, cool, then freeze in portions. Raw-frozen rhubarb holds shape better when cooked later. Keeps: 12 months.
  • Dehydrating. Slice stalks 5mm thick. Dehydrate at 55C for 8-10 hours until leathery. Rehydrate for baking or eat as tart snack chips. Keeps: 12 months.
  • Rhubarb Jam/Conserve. Chop 1kg rhubarb, combine with 800g sugar and juice of 1 lemon. Rest overnight. Bring to rolling boil, cook 15-20 minutes until setting point (105C on thermometer or wrinkle test on cold plate). Pour into sterilised jars, seal immediately. Keeps: 12-18 months.
  • Rhubarb Chutney. Combine chopped rhubarb with onion, brown sugar, vinegar, ginger, mustard seeds, and sultanas. Simmer 45-60 minutes until thick. Jar hot. Excellent with cheese and cold meats. Keeps: 12 months.
  • Rhubarb Syrup/Cordial. Simmer chopped rhubarb in water until soft. Strain through muslin. Add sugar (1:1 ratio with liquid). Boil 5 minutes. Bottle hot. Dilute with sparkling water for a refreshing drink. Keeps: 6 months (refrigerated) or 12 months (water bath processed).

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What members get

  • Soil and weather from your nearest station
  • An email when it's time to sow
  • Your own garden plan, including planning from a photo
  • Price history and price alerts
  • Pest risk alerts for your area
  • Full salt and canning detail

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Common Questions About Rhubarb

When do you plant rhubarb in Australia?

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

When should I plant Rhubarb in Cairns?

NOT RECOMMENDED. Rhubarb requires winter chill to break dormancy and produce vigorous spring growth. Tropical zones do not provide this. Plants will be weak, leggy, and short-lived if they survive at all.

What soil temperature do Rhubarb need?

Rhubarb germinate best when soil temperature is between 10°C and 25°C.

How do I know when Rhubarb are ready to harvest?

Stalks 25-40cm long, firm, and well-coloured (red, green, or pink depending on variety). Leaves fully unfurled. Stalks should snap cleanly when pulled.

What grows well with Rhubarb?

Good companion plants for Rhubarb include: Onion, Cabbage, Strawberry, Broccoli, Kale.

Are rhubarb salt tolerant?

No. Rhubarb are salt-sensitive, one of the more sensitive veggies. Use rainwater if your bore water is salty, or grow them in a raised bed of fresh mix if your soil is.

Which zone am I in?

Type your postcode into the box near the top of the page and it 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.