Colocasia esculenta

Colocasia esculenta is a large tropical aroid in the family Araceae (taro/elephant ear), grown for its big leaves and edible corms; raw parts are toxic.

Guida alla cura

Luce

Colocasia (Taro, Elephant Ear) prefers bright, indirect light to partial shade. In its natural wetland habitat it receives filtered light through a forest canopy. Direct intense sun scorches the large leaves. Outdoors in mild climates it tolerates more sun with adequate moisture.

Acqua

Colocasia is one of the thirstiest houseplants available — it naturally grows in marshes, stream banks and even shallow water. Keep the soil consistently moist to wet. Some varieties can grow with their roots submerged in water (aquatic cultivation). Never allow to dry out — wilting causes irreversible damage to the large leaves. In winter (dormancy), reduce watering significantly.

Substrato

Rich, fertile, moisture-retentive mix: 60% good potting compost, 20% coco coir, 20% perlite. Can also be grown in aquatic/marginal plant substrate for semi-aquatic cultivation.

Temperatura e umidità

Optimal 18–27 °C. Very cold-sensitive — protect from frost. In temperate climates, the corm goes dormant in autumn (leaves die back) and can be stored dry and frost-free until spring, or treated as an annual. High humidity promotes the largest leaf development.

Concimazione

Feed every 1–2 weeks during the growing season with a balanced, high-nitrogen liquid fertilizer. Colocasia is a vigorous grower and heavy feeder. Reduce in autumn as growth slows.

Potatura

Remove old or damaged leaves at the base. Colocasia grows from a corm (a swollen underground stem) and produces offsets freely — these can be separated in spring for propagation. The corms are edible when cooked (raw colocasia contains calcium oxalate and is toxic), but all above-ground parts are irritating if ingested raw.