How to grow dragon fruit
Overview
Dragon fruit is a climbing cactus grown for its sweet, colourful fruit. It thrives in warm, frost-free climates and requires a sturdy trellis for support.
Varieties
- Selenicereus undatus — White-fleshed, pink-skinned variety; most common in Australian nurseries.
- Selenicereus megalanthus — Yellow-skinned, white-fleshed; sweeter and more cold-tolerant.
Soil Preparation
Dragon fruit prefers slightly acidic to neutral soil (pH 6.0–7.0). Enrich with well-rotted compost or aged manure; ensure excellent drainage. Avoid heavy clay or waterlogged sites.
Growing Guide
Plant dragon fruit in full sun with free-draining soil, ideally sandy loam. Space plants 2–3 m apart along a strong trellis or post. Water sparingly once established; overwatering causes root rot. In subtropical and tropical zones, plant in spring to early summer for best growth.
Sowing
Sow seeds 5 mm deep in seed-raising mix; keep moist and warm (25–30°C). Germination takes 2–4 weeks. Transplant seedlings when 10–15 cm tall. Seeds are slow; cuttings are faster.
Care
Feed with a low-nitrogen fertiliser (e.g., 0-10-10) every 4–6 weeks during the growing season. Prune to one main stem and remove excess side shoots. Train onto a trellis or post for support.
Companion Planting
Grow dragon fruit with passionfruit or vanilla orchid for shared trellis support. Avoid planting near heavy feeders like corn or tomatoes that compete for nutrients.
Common Pests & Risks
Scale insects and ants can weaken plants; treat with neem oil or insecticidal soap. Fungal spots (anthracnose) appear in wet conditions; improve air circulation and avoid overhead watering.
Harvesting
Harvest dragon fruit when the skin is fully coloured (red or yellow) and gives slightly to gentle pressure. Fruit ripens 30–50 days after flowering; pick in the morning for best flavour.
In the Kitchen
Dragon fruit is best eaten fresh, chilled, or blended into smoothies. Store at room temperature for 2–3 days; refrigerate for up to a week. The flesh is mild and slightly sweet.
Troubleshooting
Yellow stems: overwatering or poor drainage. Brown spots: sunburn or fungal infection. No fruit: insufficient sun or pollination. Soft stems: root rot from wet soil. Stunted growth: lack of nutrients or support.