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














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Cyrtosperma johnstonii is the giant swamp aroid for growers who want real scale, dramatic petioles, and a little menace in the silhouette. Long mottled stalks armed with backward-facing prickles carry large arrow-shaped leaves, and in the right warm, wet environment the plant develops into a towering clump rather than a polite potted specimen.
It has the kind of tropical force that works best in greenhouses, paludarium-style setups, and very humid interiors where moisture is not a constant battle. Rich substrate, constant moisture, high humidity, stable heat, bright filtered light, and care while handling the spiny petioles are what turn it from a difficult oddity into a genuinely impressive foliage statement.
Light
Bright indirect • approx. 10,000–20,000 lux
Water
Water when ~0–10% dry
Substrate
Moisture-retentive + airy • Steady-moist • Organic-forward • Fine
Temperature
Ideal: 18–28 °C • Avoid below: 16 °C
Humidity
Humid 60–80 % +
Growth habit
upright rhizomatous geophyte herb
Support
not needed
Growth speed
High
Max size indoors
Max. height: 300 cm • Max. spread: 150 cm
Toxicity & safety
Toxic
Origin & habitat
Solomon Islands; wet tropical habitat
These metrics are standardised reference points. We compile them by reviewing and cross-checking multiple botanical and horticultural references, then refining them through real-world growing experience. Source links: Plant Care Resources.
Please use the values as guidance. Conditions vary by home, so the same plant can respond differently. For plant-specific context, read the full product description and browse our Plant Care Guides.
Your new plant has just travelled a long way and needs a calm start in its new home. For step-by-step unboxing and first-week care, check our after-delivery care guide. For deeper tips on how your plant settles in over the next weeks, read our houseplant acclimatization guide.