How to grow black elephant ear
Overview
Black elephant ear (Colocasia esculenta 'Black Magic') is a striking tropical foliage plant grown for its large, dark purple-black leaves. It thrives in consistently moist, warm conditions and is best treated as a seasonal feature in cooler zones, dying back in winter.
Varieties
- Colocasia esculenta 'Black Magic' — The classic black elephant ear with deep purple-black leaves, widely available in Australian nurseries.
- Colocasia esculenta 'Illustris' — A striking variety with dark green leaves and black veins, often sold alongside 'Black Magic'.
Soil Preparation
Prefers rich, loamy soil with high organic matter and a pH of 5.5-7.0. Before planting, work in plenty of well-rotted compost or aged manure. Ensure the soil holds moisture but does not become waterlogged; adding coarse sand or perlite can help if drainage is poor.
Growing Guide
Plant tubers 5-10 cm deep in rich, moisture-retentive soil in a position that gets morning sun and afternoon shade. Space 60-90 cm apart for maximum leaf spread. In cooler zones, start indoors in late winter and plant out after all frost risk has passed. Keep soil constantly damp during active growth; do not let it dry out for more than a day.
Care
Feed monthly from spring to autumn with a balanced liquid fertiliser (e.g., 10-10-10) to support vigorous leaf growth. Remove yellowing or damaged leaves to improve air circulation and reduce fungal disease. Apply a thick layer of organic mulch to retain soil moisture and suppress weeds.
Companion Planting
Pair with other moisture-lovers like cannas, gingers, and lotus for a lush tropical effect. Avoid planting near drought-tolerant plants like succulents or lavender, which will suffer from the constant watering.
Common Pests & Risks
Aphids and spider mites can attack in dry spells; blast off with water or use neem oil. Root rot is common in poorly drained soil—ensure good drainage and avoid waterlogging. Slugs and snails may damage young leaves; control with iron-based pellets.
Troubleshooting
Yellow leaves: usually overwatering or poor drainage—check soil and reduce watering if waterlogged. Brown leaf edges: often caused by dry air or inconsistent watering—increase humidity and keep soil consistently moist. Stunted growth: may be due to cold temperatures or lack of nutrients—wait for warmth and feed with balanced fertiliser. Leaf spots: fungal disease from wet foliage—water at soil level and improve air circulation. Tubers not sprouting: likely too cold or planted too deep—ensure soil is warm (above 15°C) and plant at correct depth.