Alocasia reversa

Alocasia reversa

Dark green midrib and primary veins run through a pale grey-green to silvery leaf surface, creating the reversed colour arrangement that gives Alocasia reversa its name. The surface can show a subtle metallic quality when viewed in angled light.

This short-rhizomed Sarawak species stays compact in warm indoor growing conditions, with several contrasting leaves forming a close cluster above the base.

Appearance and key characteristics

Mature cultivated plants are commonly around 30–35 cm tall. Several leaves arise together from a short, condensed rhizome, and papery brown cataphylls may remain around the base. Petioles are commonly around 10–20 cm long, while the thinly leathery blades are approximately 14–22 cm long and 6–10 cm wide. Their shape ranges from ovate to narrowly ovate-sagittate. Leaves can be peltate or partly peltate, with the petiole attaching slightly inside the blade on some leaves. Dark green primary veins and the midrib contrast with the grey-green to silvery leaf surface, which may appear subtly metallic in angled light. New blades can emerge softer and greener before developing their mature contrast.

Origin and natural habitat

Alocasia reversa is native to Sarawak in Borneo and has been recorded from the Padawan area. It occurs in forest over limestone, frequently growing on limestone boulders at low elevations up to approximately 300 m.

How to care for Alocasia reversa

• Light: Provide bright indirect light near an east-facing window, behind a sheer curtain or beneath a gentle grow light. Good filtered light keeps petioles compact and brings out the contrast between the dark veins and pale leaf surface.
• Water: Water thoroughly after the upper half of the substrate has dried, then allow excess water to drain. The short rhizome does best when the mix dries partly before the next watering.
• Pot and substrate: Choose a modest container with drainage and an open mix containing fine bark, pumice, perlite, coco chips and a smaller moisture-holding fraction. This keeps the compact base out of dense, wet mix.
• Temperature: Maintain approximately 20–28 °C during active growth and protect the plant from temperatures below 16 °C so roots stay active and new leaves can keep forming.
• Humidity and airflow: Around 60–75% humidity with gentle air movement suits this compact species. New leaves expand more cleanly, and the base is less likely to stay damp for too long.
• Feeding: Apply diluted balanced fertiliser every few waterings during active growth. This feeds new leaves while keeping salt build-up lower.
• Repotting: Repot when the substrate loses structure, the container becomes crowded or drying becomes uneven. Keep the pot close to the root size.
• Propagation: Divide offsets or separate growth points during active growth, retaining roots and a firm base. Small divisions may pause while rebuilding their root systems.

Common Alocasia reversa problems and solutions

• Faded leaf pattern: Muted contrast between the pale leaf surface and dark venation can result from low light, an immature leaf, heavy feeding or residue on the blade. Increase filtered brightness for the next leaf, keep feeding light and clean the blade gently.
• Several yellowing leaves: Multiple yellowing blades, a leaning base or a sour-smelling pot can indicate excess moisture, compacted substrate or cold stress. Inspect the roots and rhizome firmness, and reset the plant in a smaller open mix when necessary.
• Brown edges or patches: Dry margins or expanding brown areas can result from excess sun, low humidity, fertiliser salts, irregular watering or root stress. Review the plant’s exposure and watering, and inspect the roots when patches expand while the substrate remains wet.
• Thrips or mites: Pale stippling or surface marks on the blades or tight new growth can indicate pest feeding. Inspect the veins, blade undersides and emerging leaves during routine watering.

Is Alocasia reversa toxic to people or pets?

All parts of Alocasia reversa, including the leaves, petioles, rhizome tissue and inflorescences, contain irritating calcium oxalate crystals. If plant tissue is eaten, it can irritate the mouth and digestive tract. Keep the plant away from pets and young children, and wash your hands after pruning, division or contact with damaged plant tissue.

Name meaning and botanical background

Alocasia reversa N.E.Br. belongs to the family Araceae and was first published in 1890. The name Alocasia is conventionally derived from the Greek a, meaning “without”, and Colocasia. The specific epithet reversa refers to the reversed-looking arrangement of dark veins within the paler leaf surface.