Alocasia longiloba ‘Purple’

Background of Alocasia longiloba ‘Purple’

Alocasia longiloba ‘Purple’ is a form of Alocasia longiloba. The species grows across Southeast Asia on humid rainforest floors, in damp gullies and on rocky slopes. Rain keeps the roots moist, and water drains quickly through the rockier ground.

Growing Alocasia longiloba ‘Purple’

• Light: Provide bright diffuse light, with gentle morning sun after gradual acclimation. Protect the dark upper surface and purple reverse from intense midday rays.
• Humidity: Keep the broad purple-backed foliage in a stable 60–80% humidity range, particularly while a new blade is opening.
• Watering: Keep moisture even by watering once the surface starts to dry. Soak the pot thoroughly, allow it to drain and maintain slight moisture around the rhizome.
• Airflow: Provide gentle air movement around the foliage and exposed parts of the rhizome.
• Temperature: Keep both foliage and root zone around 21–27°C; protect the plant from temperatures below 18°C.
• Substrate: Use an open aroid blend of coco fibre or peat, bark and pumice or perlite. It should drain promptly and remain lightly moist between waterings.
• Feeding: Feed with a dilute complete formula during active leaf and root growth. Let current growth determine frequency and flush the substrate occasionally with plain water.
• Growth pauses: If active growth stops, reduce watering and hold fertiliser until new activity begins. Keep the rhizome warm and lightly moist throughout the pause.
• Leaf care: Wipe dusty leaves gently with a soft damp cloth.
• Repotting: Keep it in a snug, stable pot with the rhizome at its existing level. Leave any exposed older section above the mix.
• Propagation: Separate a well-rooted offset, corm or rhizome section carrying an active growth point during warm growing conditions.
• Handling safety: Before repotting or unpotting, disturbing the root ball, cutting, pruning, division or propagation, wear gloves and keep Alocasia sap away from skin and eyes. After handling, wash hands and clean tools.

Troubleshooting Alocasia longiloba ‘Purple’

• Purple tissue looks unusually dark: Dark upper surfaces with pinkish tones and purple undersides are normal when firm. Sudden limpness, translucence or collapse after chilling supports cold injury; move the plant to stable warmth and keep damaged tissue dry.
• Fine pale dots appear on the dark leaves: Inspect beneath the blades and along the veins for mites, eggs or webbing. Isolate the plant, rinse both surfaces and, if live mites or fresh damage remain, use a product labelled for spider mites and indoor ornamentals at the label interval.
• The plant pauses after flowering: Maintain stable warmth and check root moisture before watering. A firm rhizome and firm roots support monitoring through the pause. Water thoroughly and drain only when the root ball is genuinely dry. Resume regular feeding only when new root or leaf growth begins.
• The base becomes soft or water-soaked, or worsening wilt develops: Isolate the plant, stop watering, empty standing water and stop splash transfer. If decline persists, wear gloves and keep sap away from skin and eyes before unpotting. Retain firm roots and rhizome tissue and remove only directly confirmed mushy, hollow, slimy, foul or collapsing material with disinfected tools. Repot surviving roots in fresh airy medium in a clean draining root-sized pot, then wash hands and clean tools. Seek professional diagnosis before cutting an unclear, rapidly spreading or recurrent rhizome lesion.

Alocasia longiloba ‘Purple’: 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.

The meaning of longiloba in Purple

Latin longus, “long”, and lobus, “lobe”, combine in longiloba to describe the leaf outline. Friedrich Anton Wilhelm Miquel published Alocasia longiloba in 1856 in Flora van Nederlandsch Indië, volume 3, page 207.