Alocasia chaii – Rare Bornean Species with Striking Grey-Toned Leaves


Alocasia chaii is an extraordinary species from the foothills of the Hose Mountains in Sarawak, Borneo. Discovered in 2004 and described in 2007, this compact Alocasia brings together elegance and rugged beauty. Its leathery to slightly succulent, almost completely peltate leaves form a raised, reflexed margin and display a unique matte grey tone on the upper surface — features rarely seen in the genus. Unlike many Alocasias, the fruiting spathe turns a vivid magenta as the berries ripen, making this plant as fascinating in fruit as in foliage. This combination of subtle sophistication and vivid color shifts has made Alocasia chaii one of the most sought-after aroids among serious collectors.
 
● Key Highlights of Alocasia chaii


Compact Size: Mature height around 40 cm, suitable for limited-space displays or terrariums.
Distinctive Leaves: Broad ovate-peltate blades with a matte grey finish and red-flecked petioles.
Magenta Spathe: Turns bright magenta at fruiting, a rare feature within the genus.
Collector Appeal: Endemic to a restricted range in Sarawak, rarely seen in cultivation.
 
● Natural Habitat and Growth Pattern


This species occurs in the Kapit Division of Sarawak at 540 – 760 m elevation, on steep, leaf-littered red clay slopes under an open to moderately dense forest canopy. It grows in moist hill forests where humidity ranges from 60 – 70%, with seasonal rains from October to May. Temperatures remain cool to warm (9 – 31 °C) but never frost-prone. Indoors, success depends on stable moisture, good airflow, and high humidity. Like other Alocasias, it contains calcium oxalate crystals and is toxic to pets and humans if ingested.
 
● Care Guide for Alocasia chaii


Light: Bright, indirect light; protect from harsh sun to prevent leaf scorch.
Watering: Keep substrate evenly moist but not waterlogged; allow the top layer to dry slightly.
Humidity: Aim for 70% or higher; consider a humidity cabinet or greenhouse setting.
Temperature: Maintain 18 – 28 °C; avoid sudden temperature fluctuations.
Soil: Use a well-draining, chunky mix with organic matter, fine bark, and perlite for aeration.
Fertilizing: Apply a diluted balanced liquid fertilizer every 3 – 4 weeks during growth periods.
Repotting: Every 12 – 18 months or when roots crowd the pot; use a compact, stable container.
Propagation: Divide rhizomes carefully; each piece must have roots and an active growth point.
Dormancy: Growth may slow during cooler months; reduce watering slightly while maintaining humidity.
 
● Common Issues and How to Fix Them


Yellowing Leaves: Often caused by overwatering; improve drainage and reduce watering frequency.
Browning Margins: Linked to low humidity or fertilizer buildup; increase moisture and flush soil periodically.
Pests: Monitor for spider mites, mealybugs, and thrips; treat early with neem oil or insecticidal soap.
Pale Foliage: Insufficient light or nutrient imbalance; move to a brighter spot and adjust feeding schedule.
 
● Botanical Significance and Name Origin


Alocasia chaii belongs to the informal scabriscula group, characterized by robust habit and leathery foliage. It was named in honor of Dr. Paul P.K. Chai, a distinguished Sarawakian botanist. This species differs from its close relative A. scabriscula by its smaller size, peltate leaves, and brilliantly magenta fruiting spathe. Its original description appeared in Gardens' Bulletin Singapore in 2007.
 
● FAQs About Alocasia chaii


How rare is Alocasia chaii? Extremely rare — native to a restricted region in Sarawak and rarely cultivated outside specialist collections.
Is it suitable for terrariums? Yes, provided there is ample vertical space and stable humidity above 70%.
Does it need a dormancy period? Not a true dormancy, but growth slows in cooler months; reduce water and fertilizer slightly.
Order Alocasia chaii today and secure one of Borneo’s most exclusive and visually striking aroids for your collection!