Alocasia portei

Natural range and habitat of Alocasia portei

Alocasia portei is endemic to Luzon in the Philippines, where it grows in secondary forest at low to middle elevations. Gaps in the canopy give the plants bright, filtered light.

Growing Alocasia portei

Space: This can become exceptionally large. Give it substantial vertical and sideways room, keep the divided leaves clear of busy walkways, and use a heavy container before the plant becomes difficult to balance.

Watering: Very large pots may dry unevenly. Check the mix in several places and water before the deeper parts become dry. If growth slows and the pot takes longer to dry, wait longer between waterings. Moisten the full root zone and leave the pot to drain before returning it to its outer container.

Potting mix: In a large container, use a fertile mix that holds some moisture with enough chunky material to keep it airy and allow excess water to drain easily.

Light: Give this large plant abundant filtered daylight.

Temperature: Give Alocasia portei stable conditions around 20–30 °C; move it to a warmer position before temperatures remain under 15 °C.

Humidity: Use roughly 50–60% relative humidity and avoid stagnant air around the plant.

Feeding: While new leaves are developing, feed monthly at a moderate dose. Stop when growth slows.

Repotting: Move to a larger container when the roots are crowding the pot and need more room.

Propagation: Detach a rooted shoot from the base once it has developed a useful root system. Place the offset in a separate pot and maintain warmth until it resumes root and leaf growth.

Water quality: If your tap water is hard, use room-temperature rainwater or another low-mineral water to reduce mineral residue in the potting mix.

What to check when Alocasia portei is struggling

• The large crown loses firmness while the pot is still holding moisture: Stop watering and inspect the roots and lower stem for soft or rotten tissue. If you find rot, use a disinfected blade to cut away only the rotten tissue back to firm, healthy tissue, discard the removed material and repot the plant in fresh, airy mix in a clean pot sized to the roots that remain. If you cannot clearly tell where rotten tissue ends and healthy tissue begins, stop cutting and send Foliage Factory clear photos of the roots and lower stem. Follow our root rot guide for the full recovery process.
• New leaves become progressively smaller: Check the light and root health first. If both are sound and the plant is actively growing, make sure normal feeding has not been missed. Resume the usual label rate if needed, but do not increase the dose to make up for earlier missed feeding.
• Fine stippling spreads across the divided leaves: Check the undersides and main veins for spider mites. Isolate the plant if mites are present and use a treatment labelled for spider mites and indoor ornamental plants. Repeat it only as directed on the label.
• Fresh divided leaves open scarred, silvery or distorted: Look inside new growth for thrips and tiny black droppings. Isolate the plant if thrips are present and use a treatment labelled for thrips and indoor ornamental plants. Repeat it only as directed on the label.

If you're not sure what is causing the problem, or the plant keeps getting worse after you have corrected the likely cause, send us clear photos of the plant and the affected areas so we can help.

Alocasia portei: 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 portei honours

Portei commemorates the French plant collector Marius Porte. Heinrich Wilhelm Schott first described Alocasia portei in 1862 in Bonplandia (Hannover), volume 10, page 148.