Which is easier to care for, Colocasia Thailand Giant or Alocasia Macrorrhiza (Elephant Ear)?

Colocasia Thailand Giant: You have a pond margin, bog garden, or a spot that stays genuinely wet. Alocasia Macrorrhiza (Elephant Ear): Your soil or container drains well and does not stay waterlogged

Plant Comparison

Colocasia Thailand Giant vs Alocasia Macrorrhiza

Both of these are sold as the biggest elephant ear you can grow, and they belong to different genera entirely — which matters for care, not just size. Thailand Giant is a true Colocasia and wants constant wet soil, even standing water. Macrorrhiza is an Alocasia and, like the rest of its genus, rots if kept as wet as a Colocasia wants to be. Mixing up which is which is the single most common way both plants die.

Colocasia Thailand Giant

Colocasia gigantea 'Thailand Giant'

One of the largest Colocasia cultivars, with leaves over a metre long on thick stems. A true Colocasia — loves constant wet soil and standing water.

Photo: Qon Kua / CC BY-SA 4.0 · Wikimedia Commons

Alocasia Macrorrhiza (Elephant Ear)

Alocasia macrorrhiza

A giant Alocasia with glossy, huge, upward-held leaves. Unlike Colocasia, it needs well-drained soil and rots quickly if kept constantly wet.

Side-by-Side Comparison

CategoryColocasia Thailand GiantAlocasia Macrorrhiza (Elephant Ear)

🔎 Leaf directionLeaf tips droop, stem attaches inside the bladeLeaf tips point up, stem attaches at the notch

📏 Maximum leaf size★Up to 1–1.5 m long — genuinely enormousUp to 1 m — very large but usually smaller

💧 WateringLoves standing water; a bog or pond margin is idealMoist but well-drained; rots if kept wet like Colocasia

💡 Light needs★Full sun to part shade — very sun tolerantBright indirect to part shade — scorches in harsh sun

🌡️ Temperature20–32°C; dies back hard in cold18–30°C; also cold-sensitive

📈 Growth rate★Very fast in a warm wet summerFast, but slower than Thailand Giant

🪴 Best usePond margin, bog garden, large outdoor bedLarge outdoor bed or oversized container

😴 DormancyDies back to the tuber outdoors in coldDies back or drops leaves in cold or dry cold air

🐛 Pest riskAphids, spider mites — moderate outdoorsSpider mites — more of a problem indoors

🎯 DifficultyIntermediate — mostly about space and waterIntermediate — mostly about avoiding overwatering

Choose Colocasia Thailand Giant if…

✓You have a pond margin, bog garden, or a spot that stays genuinely wet
✓You want the single largest leaf possible in one season
✓You have full, harsh sun that would scorch most other giant aroids
✓You are planting outdoors for the summer, not keeping it as a houseplant

Colocasia Thailand Giant Problem Guide →

Choose Alocasia Macrorrhiza (Elephant Ear) if…

✓Your soil or container drains well and does not stay waterlogged
✓You want a giant leaf plant that also works as a large indoor specimen with bright light
✓You have already killed a Colocasia by underestimating how wet it wants to be
✓You prefer upright, glossy leaves to Colocasia's drooping habit

Alocasia Macrorrhiza (Elephant Ear) Problem Guide →

What They Have in Common

•Both are giant aroids commonly sold under the 'elephant ear' name, causing constant confusion
•Both die back to a tuber or rhizome in cold weather and regrow from it
•Both are toxic if eaten raw and need calcium oxalate caution around pets and children
•Both need heavy feeding in the growing season to reach their full size

The Verdict

Check the genus before you water, not just the size. Thailand Giant is a Colocasia and wants to sit wet — treat it like Alocasia and it stays small and unhappy. Macrorrhiza is an Alocasia and rots in the boggy conditions Thailand Giant loves. Get the genus right and both plants reward you with genuinely enormous leaves by the end of summer.

🌊 Colocasia Thailand Giant

🩺 Problem Guide →🌿 Care Guide →

🐘 Alocasia Macrorrhiza (Elephant Ear)

🩺 Problem Guide →🌿 Care Guide →