How to Grow Chillies in Australia
Heat ratings, drying methods, and variety picks for every region
Chillies are one of the most rewarding crops you can grow at home. A single plant produces dozens of fruit over a long season, and the range of heat levels and flavours is enormous. From mild jalapenos to face-melting ghost peppers, there is a chilli for every palate. They also grow brilliantly in pots, making them perfect for balconies and small spaces.
This guide covers the best chilli varieties for Australian gardens, heat ratings explained, drying methods, and when to plant in your region.
When to Plant in Your Region
Birds Eye
Small, fiery chillies that grow upright on compact plants. 50,000 to 100,000 Scoville units. A staple in Thai and Vietnamese cooking. Very productive and suits pots. Prolific in warm and tropical climates.
Cayenne
Long, thin red chillies with moderate heat (30,000 to 50,000 Scoville). Excellent fresh, dried, or ground into cayenne pepper. Reliable producer in all warm regions. Plants grow to about 60 cm tall.
Habanero
Lantern-shaped chillies with intense, fruity heat (100,000 to 350,000 Scoville). Not just hot, they have a distinctive tropical flavour. Need a long, warm season. Best in subtropical and tropical regions.
Jalapeno
Thick-walled, medium-heat chilli (2,500 to 8,000 Scoville). Versatile in the kitchen: fresh, pickled, smoked (chipotle), or stuffed. Compact plants produce heavily. Good for beginners because the heat is manageable.
Ghost Pepper (Bhut Jolokia)
Extremely hot chilli (1,000,000+ Scoville). Not for the faint-hearted. Needs a long, very warm season to ripen fully. Grow as a challenge crop in warm climates. Handle with gloves.
Heat Ratings: The Scoville Scale
Chilli heat is measured in Scoville Heat Units (SHU). Here is a rough guide:
- Mild (0 to 5,000 SHU): Banana pepper, Anaheim
- Medium (5,000 to 50,000 SHU): Jalapeno, Cayenne
- Hot (50,000 to 350,000 SHU): Birds Eye, Habanero
- Extreme (350,000+ SHU): Ghost Pepper, Carolina Reaper
Heat level is affected by growing conditions. Stressing plants slightly (less water, more sun) tends to increase heat. Well-watered plants in rich soil produce milder fruit.
Drying Methods
Chillies preserve brilliantly by drying. Dried chillies last for a year or more and can be ground into flakes or powder.
- Air drying: Thread chillies on a string through the stems and hang in a warm, dry, well-ventilated spot. Takes 2 to 4 weeks. Works best with thin-walled varieties (Cayenne, Birds Eye).
- Oven drying: Spread chillies on a baking tray and dry at the lowest oven setting (50 to 70 degrees) for 6 to 8 hours with the door slightly open. Check regularly.
- Dehydrator: The most reliable method. Set to 55 degrees and dry for 8 to 12 hours. Even thick-walled chillies (Jalapeno, Habanero) dry perfectly.
- Smoking: Smoke-drying jalapenos creates chipotles, which have a rich, smoky heat. Use a cold-smoking setup for best results.
Growing Method
- Start seeds indoors 8 to 10 weeks before transplanting. Chillies are slow to germinate and need warmth (25 to 30 degrees for best results). Use a heat mat or warm spot.
- Transplant after all frost risk has passed. Wait until overnight temperatures are reliably above 15 degrees.
- Plant in full sun. Chillies need at least 6 to 8 hours of direct sun for good fruit production.
- Space plants 40 cm apart. Chillies are compact plants that do not need as much room as tomatoes.
- Feed fortnightly once flowering begins with a potassium-rich liquid fertiliser. Too much nitrogen produces leaves at the expense of fruit.
- Water consistently. Even moisture prevents blossom end rot and flower drop. Slight under-watering increases heat levels.
Common Problems
Flower drop
Flowers falling without setting fruit. Caused by temperatures below 15 degrees or above 35 degrees, or by too much nitrogen fertiliser. Wait for temperatures to stabilise.
Aphids
Cluster on new growth and can spread viruses. Spray with soapy water or neem oil. Encourage ladybirds as natural predators.
Blossom end rot
Dark, sunken patches on the base of fruit. Same cause as in capsicums: inconsistent watering. Water evenly and mulch to maintain soil moisture.
Track Your Chilli Growing
Add chillies to your garden in the Planting Season app and get reminders for sowing, feeding, and harvest time.
Open the App →Frequently Asked Questions
When should I plant chillies in Australia?
Start chilli seeds indoors 8 to 10 weeks before the last expected frost. Transplant outdoors when overnight temperatures are reliably above 15 degrees. In most regions, transplant from October to December. Tropical regions can plant almost year-round.
How long do chillies take to grow?
Chillies take 12 to 20 weeks from transplanting to first harvest, depending on variety. Jalapenos and Cayenne ripen in 12 to 14 weeks. Habanero and Ghost Pepper need 16 to 20 weeks of warm weather.
Can chilli plants survive winter?
In frost-free areas, chilli plants can live for several years. Cut back to about 15 cm in late autumn, reduce watering, and they will reshoot in spring. In frosty areas, grow as annuals or bring pots indoors over winter.
How do I make chillies hotter?
Mild stress increases heat. Reduce watering slightly once fruit begins to form. Full sun exposure also increases heat. The hottest chillies come from plants in full sun with slightly dry conditions.
See also: Chillies in the Plant Library
