When to Plant Chilli peppers in Cairns, Tropical Guide
Also called chili, hot pepper.
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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This Chilli peppers 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.
- Planting window
- Feb to Aug
- Days to harvest
- about 11 weeks
- Sun
- Full sun
- Water
- Regular
- Spacing
- 45 cm apart
- Soil pH
- 6.0–6.8
Chillies are warm-season Solanaceae grown for their pungent fruit. Five cultivated species exist, with C. annuum (jalapeno, cayenne) and C. chinense (habanero, reaper) being most popular.
Published · By GardenBuddy.au
Planting dates, current conditions and prices on this page update daily.
Photo: Wikimedia Commons
Planting Calendar for Tropical
- Jan -
- Feb S
- Mar S/T
- Apr S/T
- May S/T
- Jun S/T
- Jul S/T
- Aug T
- Sep -
- Oct -
- Nov -
- Dec -
S = Seed Tray T = Transplant D = Direct Sow
Want a nudge when it is sowing time?
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How to Grow Chilli peppers in Tropical Australia
- Soil
- Well-drained, moderately fertile soil with compost. Slightly acidic preferred. Overly rich soil produces foliage over fruit.
- Salt
- Moderately sensitive. Copes with a little salt, but the harvest drops on salty bore water.
- pH Range
- 6.0-6.8
- Sunlight
- Full sun (minimum 6-8 hours). More sun = more heat in the fruit.
- Spacing
- 45cm apart, 60cm between rows
- Watering
- Moderate and consistent watering. Slightly less water than capsicums. Some controlled water stress when fruit is ripening increases capsaicin (heat) levels. Avoid waterlogging.
- Good companions
- Tomato, Basil, Marigold, Oregano, Coconut
- Keep away from
- Fennel
- Grow before it
- Leafy greens and brassicas (Lettuce, Silverbeet, Broccoli)
- Grow after it
- Roots and alliums (Carrot, Beetroot, Onion)
Give the bed 3 turns before nightshades go back in. Tomato, capsicum, eggplant and potato share wilts and blights that live on in the soil.
Tropical Growing Tips for Chilli peppers
Recommended Varieties
- Habanero (C. chinense)
- Bird's Eye (C. frutescens)
- Scotch Bonnet
- Trinidad Scorpion
Key Challenges
- Fruit fly year-round
- Bacterial wilt in wet season
- Anthracnose in rain
Pro Tips
- This is the ultimate chilli climate. Super-hot varieties produce their hottest fruit here
- Plants are true perennials in the tropics. Prune back hard once a year and they regrow vigorously
- Bird's Eye chillies grow wild in tropical Australia and self-seed freely
Pests and problems for Chilli peppers in Tropical
- Bacterial Wilt Bacterial wilt in wet season Watch
- Queensland Fruit Fly Watch
- Bacterial Spot Watch
- Tomato Potato Psyllid Watch
- Tomato Spotted Wilt Virus Initial symptoms appear on young growth: bronze or coppery discolouration with tiny dark flecks on expanding leaves, giving a metallic... Watch
- Helicoverpa / Corn Earworm / Tomato Grub Watch
- Mosaic Viruses Use clean seed and seedlings, and control sap sucking insects (AUSVEG). Watch
- Fruit fly year-round Fruit fly year-round Watch
Harvesting Chilli peppers
When ready: Depends on variety and intended use. Green chillies: full-sized, firm, glossy. Ripe chillies: fully coloured (red, orange, yellow etc.). Hotter when fully ripe. Some varieties (jalapeno) can be used green or red.
How to harvest: Cut with scissors or secateurs leaving short stem. Do not pull. Wear gloves when harvesting super-hot varieties. Capsaicin on fingers causes painful burning if you touch eyes, nose or other sensitive areas.
Storing and preserving chilli peppers
How to keep it
- Dehydrating / Drying. Thread whole chillies onto string through stems (ristras). Hang in dry, airy location. Alternatively, halve and dehydrate at 60C for 6-12 hours until brittle. Store whole or grind into chilli flakes/powder. Sun-drying works well in arid and Mediterranean climates. Keeps: 12+ months.
- Freezing. Wash and dry chillies. Freeze whole in zip-lock bags. No blanching needed. Frozen chillies can be grated directly into dishes while still frozen. Texture softens on thawing but flavour is preserved. Keeps: 12 months.
- Fermented Hot Sauce. Roughly chop chillies (with gloves for hot varieties). Pack into jar. Cover with 3% salt brine (30g salt per litre water). Weight down to keep submerged. Cover loosely. Ferment at room temperature for 1-4 weeks until sour and bubbly. Blend smooth with vinegar to taste. Bottle. Keeps: 6-12 months refrigerated.
- Pickling. Slice chillies into rings (wear gloves). Pack into sterilised jars with garlic and herbs. Pour hot vinegar brine (equal parts vinegar and water, 1 tbsp salt, 1 tbsp sugar per 500ml). Process in boiling water bath 10 minutes. Keeps: 12 months.
- Chilli Oil. Dry or dehydrate chillies until crisp. Crush or flake. Heat neutral oil (rice bran, sunflower) to 180C. Pour hot oil over chilli flakes in a heat-proof jar. Sizzle is expected. Cool and seal. Stir before use. Keeps: 6 months at room temperature, 12 months refrigerated.
Canning safety. Low-acid vegetables like chilli peppers must be pressure canned, never water-bath canned.
What chilli peppers costs in the shops right now, retailer by retailer, updated daily.
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
Common Questions About Chilli peppers
When do you plant chilli peppers in Australia?
It depends on your climate zone, not the calendar month alone. Planting months by zone:
- Tropical (Cairns): Feb to Aug
- Subtropical (Brisbane): Jan to Mar, Aug to Dec
- Warm Temperate (Sydney): Aug to Nov
- Cool Temperate (Melbourne): Aug to Dec
- Cold / Highland (Canberra): Aug to Dec
- Arid / Semi-Arid (Alice Springs): Jan to Feb, Jul to Dec
- Mediterranean (Perth): Jan, Jul to Dec
Can you grow chilli peppers all year round in Cairns?
No. In the Tropical zone the planting months are Feb to Aug. Outside that window it either bolts, sulks or gets cut down by the weather.
What else is chilli peppers called?
Chilli peppers is the usual Australian name. Overseas seed packets and recipes call it chili, hot pepper. Same plant, same growing advice.
When should I plant Chilli peppers in Cairns?
Chillies grow all year around Darwin and crop for several years as short-lived perennials. Start new plants from the end of the wet; the super-hot types love the heat.
What soil temperature do Chilli peppers need?
Chilli peppers germinate best when soil temperature is between 20°C and 35°C.
How do I know when Chilli peppers are ready to harvest?
Depends on variety and intended use. Green chillies: full-sized, firm, glossy. Ripe chillies: fully coloured (red, orange, yellow etc.). Hotter when fully ripe. Some varieties (jalapeno) can be used green or red.
What are the best Chilli peppers varieties for Cairns?
Recommended varieties for the Tropical zone include: Habanero (C. chinense), Bird's Eye (C. frutescens), Scotch Bonnet, Trinidad Scorpion.
What grows well with Chilli peppers?
Good companion plants for Chilli peppers include: Tomato, Basil, Marigold, Oregano, Coconut.
Are chilli peppers salt tolerant?
Only a little. Chilli peppers are moderately sensitive to salt, so the harvest drops on salty bore water. Mix salty water with rainwater, and mulch the bed.
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.