Chillies: Care & Harvest (Part 2)
4. Transplanting & Plant Care
Transplant timeline:
• Seedlings are generally ready for larger pots or greenhouse beds 6–8 weeks after sowing, once they have 4–6 true leaves.
Space plants 30–45 cm apart, with 60–90 cm between rows. Support plants with stakes, cages, or string, especially once fruit forms.
Pruning helps keep plants tidy, improves airflow, and encourages bigger harvests. Pinch early flowers and remove the lowest leaves to reduce disease risk. Pruning during winter is particularly useful in NZ greenhouses where humidity can build up.
Regular monitoring is key—check plants for pests, adjust watering, and manage temperature and humidity. Chilli plants grown in greenhouses typically produce more and larger fruit than outdoor-grown plants.
5. Feeding Your Chillies
Chillies need steady nutrients throughout their growth.
• Seedling stage: use a diluted nitrogen-rich liquid fertiliser to promote leafy growth
• Flowering stage: switch to fertiliser higher in phosphorus and potassium
• Fruit development: continue with potassium-rich feeds for better fruit size and flavour
Organic options commonly used by NZ gardeners—such as compost teas, liquid seaweed, and worm castings—boost soil health and plant resilience. Feed every 2–3 weeks, following product directions. Avoid overfeeding, which can produce too much foliage and fewer fruit.
Look out for deficiencies:
• Yellowing leaves may indicate low nitrogen
• Brown spots on the bottom of fruit (blossom end rot) may signal calcium issues or inconsistent watering
6. Common Problems & Solutions
Even in a greenhouse, chillies can be affected by pests and disease.
Pests: aphids, whitefly, spider mites, thrips
Use beneficial insects (like ladybirds), neem oil, or insecticidal soap if needed.
Diseases: powdery mildew thrives in humid conditions
Improve airflow, remove affected leaves, and use organic fungicides if required. Root rot is common in poorly drained soil—ensure good drainage in pots and beds.
Environmental issues:
• Excess heat can cause flowers to drop—use shade cloth or open vents/windows on hot days
• Poor pollination—gently shake plants or use a soft brush to help move pollen
7. Harvesting
Harvest timeline:
• Chillies are usually ready 12–16 weeks after sowing, depending on the variety and greenhouse conditions.
• Green chillies are milder; once they turn red, yellow, or orange, they become sweeter and hotter.
Regular harvesting encourages continual fruiting. Use scissors or secateurs to avoid damaging stems. Wear gloves when handling hot varieties.
For seed saving, choose your best fruits, remove the seeds, and dry them completely before storing for next season.
8. Conclusion
Growing chillies in a greenhouse in New Zealand gives you a longer season, protection from the elements, and consistently healthier plants. By sowing seeds between September and January, transplanting seedlings once established, maintaining good greenhouse conditions, feeding regularly, and keeping an eye out for pests and diseases, you’ll enjoy an abundant supply of homegrown chillies.
Key tips for NZ growers:
• Sow seeds September–January
• Transplant after 6–8 weeks
• First harvest usually 12–16 weeks after sowing
• Maintain good airflow, steady watering, and regular feeding
• Harvest frequently to encourage more fruit
With care and consistency, your greenhouse chillies will reward you with fresh, colourful, and spicy harvests throughout the season in New Zealand.
