Light
Bright indirect • approx. 10,000–20,000 lux
Buy 4 plants, get 1 free
Araceae
Cyrtosperma johnstonii
- Curated selection:
Every plant is hand‑picked for health and visual appeal, so you receive a strong, well‑established plant.
- Representative photos:
Product images show a typical plant of this variety. Natural differences in leaf number, shape or variegation are normal, your plant will still match in type and quality.
- Size details:
Listed sizes refer to pot diameter (cm) and approximate overall height (cm) from the base of the pot to the tallest leaf or stem.
- “Get What You See” items:
If you are buying the exact plant shown in the photos, this is clearly stated in the size section.
- Individual photos:
One‑off photos are only provided when this is explicitly mentioned in the size section. - For special traits or small quirks, please check the full product description.
VAT included · plus
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.
- Care basics , Main hub with links to all houseplant care guides.
- After delivery & first week , Unpacking, first placement, and early recovery.
- Light, How much light houseplants really need indoors.
- Watering , When to water and how to avoid root rot.
- Substrates & roots, Potting mixes and drainage for strong root systems.
- Humidity, When humidity matters and what actually helps.
- Fertilizing, Simple feeding routine without burning roots.
- Problems & pests, Yellow leaves, brown tips, bugs, and fixes that work.
- Semi-hydro, How to run low-maintenance mineral substrates.
Secure shipping, carefully packed orders with safe delivery across the EU, UK and Switzerland.
28-day plant guarantee, if a plant arrives damaged or fails soon after delivery, we help you make it right.
Free returns, simple, cost-free returns according to our policy.
For full details, please see:
Please head to our FAQ Page or Contact us.
Cyrtosperma johnstonii
Quick Care Guide
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
How to read these values
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.
- Light: level and approximate lux at leaf level.
- Watering: “% dry” shows how far the substrate should dry before watering again.
- Substrate: structure, drainage, moisture retention, base material and particle size.
- Temperature: “Ideal” shows the preferred range; “Avoid below” marks the cold-stress threshold.
- Humidity: target range; steady conditions usually matter more than exact numbers.
- Growth habit: how the plant grows, such as upright, climbing, trailing, clumping or rosette-forming.
- Support: whether a stake, pole or trellis is needed, optional or unnecessary.
- Growth speed: expected pace under suitable indoor conditions; use as a guide, not a promise.
- Max size indoors: realistic long-term indoor size under good conditions.
- Toxicity & safety: irritation, toxicity or physical hazards such as spines or bristles.
- Origin & habitat: native range, hybrid background or typical habitat where relevant.
- Outdoor growing: when a potted indoor plant can be placed outside and what outdoor protection it needs.
Cyrtosperma johnstonii
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 warm aroid care
- Light: Give strong indirect light. Direct hot sun can scorch the blades, especially behind glass.
- Watering: Keep the substrate consistently moist while the plant is growing.
- Substrate: Use an open aroid mix with bark, coco fibre, organic matter and mineral material.
- Rhizome care: Keep the rhizome warm, moist and well aerated. Avoid cold, compact, waterlogged substrate.
- Temperature: Aim for 20–28 °C where possible. Cool roots slow growth and raise the risk of rot.
- Humidity: Higher humidity reduces crisp edges as new leaves expand.
- Feeding: Feed during active growth, when roots are warm and the substrate stays open.
- Potting: Use a broad, heavy pot as the plant gets taller. Move up in pot size gradually.
- Handling: Handle the base carefully, because rhizome damage can set the plant back quickly.
- Propagation: Separate offsets once they have their own roots and visible growing points.
Cyrtosperma johnstonii rhizome and leaf checks
- Collapsed petiole: Interrupted water uptake, cold stress, dry roots or early rot can make a petiole collapse.
- Soft base or rhizome: Cold, wet or compact substrate usually causes this. Improve warmth and move the plant into a more open mix before the damage spreads.
- Repeated yellowing: Look at feeding, root warmth and watering consistency.
- Crisp leaf edges: Crisp edges often come from dry air, uneven moisture or hot airflow.
- Leaning plant: Use a heavier pot and check whether the root ball is stable.
- Thrips or spider mites: Inspect the undersides of large leaves regularly.
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.
FAQs about Cyrtosperma johnstonii
Recently viewed:
Sign up for Foliage Factory newsletter for early access to new arrivals and practical care tips that work in real homes.