How to grow giant taro
Overview
Giant taro (Alocasia macrorrhizos) is a massive, fast-growing tropical perennial grown for its bold, architectural leaves and dramatic presence. It is not a true taro but a close relative, and requires warm, humid conditions with protection from frost to thrive.
Varieties
- Alocasia macrorrhizos 'Variegata' — A striking variegated form with cream and green splashes, popular in Australian tropical gardens.
Soil Preparation
Prefers rich, loamy soil with a pH of 5.5–7.0. Amend with plenty of organic matter (compost, aged manure) before planting to improve fertility and moisture retention. Ensure excellent drainage to prevent root rot.
Growing Guide
Plant corms or potted specimens in rich, well-draining soil in a sheltered spot with dappled shade or morning sun. Space at least 1.5 m apart to allow for full spread. Keep soil consistently moist but not waterlogged; water deeply during dry spells. Apply a thick layer of organic mulch to retain moisture and suppress weeds. In cooler zones, grow in a large pot and move indoors or to a warm spot over winter.
Care
Feed monthly with a balanced liquid fertiliser during the growing season (spring–summer). Remove yellowing or damaged leaves to reduce pest risk and improve air circulation. Divide corms every 2–3 years to maintain vigour and prevent overcrowding.
Companion Planting
Pair with other bold tropicals like elephant ears, cannas, and gingers for a lush, layered effect. Avoid planting near small, delicate plants that will be overshadowed or smothered by the giant taro's spreading leaves.
Common Pests & Risks
Spider mites and scale can infest leaves, especially in dry or dusty conditions. Root rot from overwatering or poor drainage is common; ensure soil is free-draining and avoid waterlogging. Treat infestations with neem oil or insecticidal soap.
Troubleshooting
Yellow leaves: often from overwatering or poor drainage; reduce water and improve soil drainage. Brown leaf edges: caused by dry air or underwatering; increase humidity and water more regularly. Stunted growth: may indicate nutrient deficiency; apply a balanced fertiliser. Leaf drop: can be from cold stress; protect from temperatures below 10°C.