Alocasia chaii

Botanical origin of Alocasia chaii

Alocasia chaii grows on steep forest slopes in the hills of Sarawak, beneath light to moderate shade. Its roots grow in clay-rich soil covered with fallen leaves. The forest air is humid, the ground stays moist and water drains down the slope after rain.

Care for Alocasia chaii

• Potting mix: Use a loose, rich mix that does not stay heavy and wet around the roots.
• Watering: Check the mix frequently while new growth is developing. Water again once the upper part starts drying, before the mix dries all the way through. Wet the whole mix until excess runs from the drainage holes. Let the pot drain, then empty any water left in the saucer or cover pot.
• Humidity: Use a humidity range around 60–80%. Keep a little air moving around the foliage.
• Light: Give it bright filtered light and protect it from prolonged hot sun.
• Temperature: Give Alocasia chaii stable conditions around 18–29 °C; move it to a warmer position before temperatures remain under 15 °C.
• Feeding: Use a complete houseplant fertiliser at low to moderate strength while Alocasia chaii is forming new leaves. Use less fertiliser during slower growth and pause if growth stops.
• Propagation: New plants can be made from rooted offsets or firm corms removed from a mature plant and established warm.
• Repotting: Move up one pot size when the root system is crowded and needs more room.

When Alocasia chaii shows signs of trouble

• Small wet-looking bumps appear on the thick leaves and later turn rough: This is often oedema, a moisture-related problem that can appear when the pot stays too wet for the conditions. Let excess water drain, give the potting mix more time to dry and keep gentle air movement around the leaves. If the spots stay soft, turn dark or spread quickly instead, keep the foliage dry and send Foliage Factory clear photos.
• A new leaf opens rough, silvered or misshapen: Look inside the folded growth and around the bases of the leaf stalks for thrips. The thick matte surface can have some natural texture, but fresh scraped-looking scars, tiny black specks or visible insects are different. When thrips are confirmed, move Alocasia chaii away from nearby plants. Use a treatment labelled for thrips on indoor ornamental plants, repeating it according to the label. The thrips guide shows what to watch on the next leaves.
• Fine pale speckles make the matte grey leaves look dusty: Turn the leaves over and check the veins for spider mites. Moving mites or fine webbing confirm the problem. Keep the plant separate from nearby plants and use a treatment labelled for spider mites on indoor ornamental plants, repeating it according to the label. Our spider-mite guide explains the follow-up.
• The leaf margins become crisp after the plant has dried out: Water a genuinely dry root ball thoroughly and let the excess drain. Then keep moisture more even and protect the plant from hot, dry air. If the pot is already damp and crisping continues, check the roots before watering more often.

Alocasia chaii: toxic if chewed

• Pets: This Alocasia is toxic to cats and dogs. Keep the plant and any cut pieces where pets cannot chew them.
• Children and handling: Keep it out of reach of children. Sap from damaged tissue can irritate skin and eyes, so wash your hands after pruning and avoid touching your face.
• Why it irritates: Alocasia tissue contains insoluble calcium oxalate crystals. Chewing or contact with sensitive tissue can cause immediate local irritation.
• Possible symptoms: Mouth exposure can cause burning pain, drooling, swelling, nausea or vomiting, and difficulty swallowing.
• After exposure: For a pet, contact a veterinarian. For a person, remove any plant material from the mouth and rinse with water; seek medical or poison-control advice if symptoms are significant. Breathing difficulty or rapidly increasing swelling needs urgent medical attention.

Who chaii honours

Chaii honours Dr Paul P. K. Chai, formerly Forest Botanist in Sarawak.

Peter Charles Boyce first described Alocasia chaii in 2007 in Gardens’ Bulletin Singapore, volume 58, page 142.