Light
Bright indirect • approx. 10,000–20,000 lux














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Quick Care Guide
Light
Bright indirect • approx. 10,000–20,000 lux
Watering
Water when ~0–10% dry
Substrate
Moisture-retentive + airy • Steady-moist • Organic-forward • Fine
Temperature
Ideal: 20–28 °C • Avoid below: 16 °C
Humidity
Humid 60–80 % +
Growth habit
Upright clumping herbaceous perennial.
Support
not needed
Growth speed
High
Max size indoors
Max. height: 300 cm • Max. spread: 150 cm
Toxicity & safety
Toxic
Origin & habitat
Native to Solomon Islands
Outdoor growing
Outside from 15 °C · sheltered spot
These care values are quick reference points for indoor growing. Use them as a guide, then adjust for pot size, substrate, temperature and how quickly the substrate dries.
For more detail, read the full product description or visit our Plant Care Guides.
Broad arrow-shaped leaves rise on tall, patterned petioles in Cyrtosperma johnstonii. Young plants often start with one stronger crown, then build a wider clump as new shoots develop from the base.
This large aroid is native to the Solomon Islands, where it grows with warmth and steady moisture. Its roots need moisture without losing airflow.
The plant grows from a thick rhizome base. The petioles are long and often mottled, and mature plants may develop small prickles on them. Larger leaves develop when the plant has bright filtered light, warm roots and regular feeding. Cyrtosperma johnstonii can produce typical aroid flowers: a leaf-like spathe around a central spadix. Indoors, it is mainly grown for its large leaves and patterned petioles.
Cyrtosperma johnstonii should be treated as an irritating aroid if ingested. Keep it away from pets and children, and use gloves when handling damaged tissue, the rhizome or prickled mature petioles.
Cyrtosperma johnstonii is the accepted name. It has also been linked to Alocasia johnstonii in older references. “Cyrtosperma” is commonly interpreted as “curved seed”, while “johnstonii” is a commemorative name.
Plant names, growth habits, natural habitats and indoor care guidance are checked against trusted botanical, habitat and horticultural references before publication.View our plant care resources and references.