The Alocasia genus contains roughly 80 species native to tropical Asia and Australia — not South America, despite the commercial name "Amazonica." The popular 'Polly,' Zebrina, and 'Frydek' all want the same things: dappled light, evenly moist (never soggy) soil, and enough humidity to keep spider mites off the undersides of the leaves.
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What it is
The three Alocasia you'll see most often in stores:
- 'Polly' / 'Amazonica' — a compact horticultural hybrid (Alocasia × amazonica) created at a Florida nursery in the 1950s from A. longiloba × A. sanderiana. Kew POWO lists the hybrid name as unplaced — "Amazonica" is a commercial name, not a valid scientific species, and the parent species are Southeast Asian.
- Zebrina — Alocasia zebrina, an accepted species native to the Philippines.
- 'Frydek' / Green Velvet — a cultivar of Alocasia micholitziana, also from the Philippines.
All three are tropical understory plants. NC State Extension and Missouri Botanical Garden describe the same general care profile across the genus.
Light
Dappled sunlight or partial shade. MBG specifies "best in part shade or filtered sun." NC State lists the light conditions as dappled sunlight (shade through upper canopy all day) or partial shade with 2–6 hours of part-day direct sun.
In practical window terms, a position a few feet back from an east window — so the plant receives the indirect ambient light but not direct sun on the leaf surface — is ideal. Behind a sheer curtain on a south window also works. Strong direct afternoon sun scorches the leaves, especially on the velvety-textured Frydek and the thin-leafed Polly, which are more susceptible to burn than the thicker-leaved Zebrina.
Signs of too much light: bleached or brown patches on the upper leaf surface, papery texture where the sun hit, yellowing of the entire leaf rather than isolated browning. Signs of too little light: slow growth, very elongated petioles (the stems holding each leaf) as the plant stretches, loss of the white veining contrast that makes the species distinctive. NC State notes inadequate light as one of three causes of leaf yellowing, alongside overwatering and underwatering.
Watering
Keep the soil evenly moist during the growing season. NC State advises watering and fertilizing regularly during active growth, and explicitly reducing watering in winter before the plant is brought back to active conditions in spring.
Daytime temperatures should range from 68 to 77°F (20–25°C) for active growth per NC State. In summer, check soil moisture every 4–6 days and water when the top inch of soil is dry. In winter, when the plant may enter dormancy and drop leaves, reduce to watering only when the soil has dried significantly — approximately every 10–14 days.
Top-watering is standard. Bottom-watering is not ideal for Alocasia because the corms need some drying between waterings to avoid rot — the plant benefits from the surface soil drying somewhat before the next watering cycle. Alocasia is not sensitive to tap water chlorine or fluoride, so municipal water is fine.
NC State flags overwatering as the cause of both root rot and leaf spots — yellowing leaves can mean too much water, too little, or too little light, so check the soil before reacting. Overwatering symptoms: mushy stem base, yellowing leaves spreading from the lower leaves upward, soil that stays wet for 2 weeks. Underwatering symptoms: curling or drooping leaves, dry soil pulling away from pot edges.
The tubers/corms underneath store enough energy that an Alocasia can drop every leaf during cold weather or stress and still re-emerge from the rhizome. If your plant collapses but the corm is firm, leave it potted and dry-ish, not in the trash.
Humidity
High humidity — above 60% relative humidity is the target for this genus. MBG recommends overwintering in a "humid, cool (around 60–65°F) location." A room humidifier is the most reliable method; a pebble tray under the pot provides passive supplemental humidity.
Misting is not an effective humidity solution — it raises local humidity for minutes only and can leave water on the leaf surface that promotes fungal spots. Spider mites are the #1 problem on indoor Alocasia, and they thrive in dry air (below 40% humidity). Maintaining high humidity is therefore both a plant health measure and the most effective long-term pest prevention strategy.
Soil and pH
Slightly acidic, moist, well-drained, humus-rich loam. NC State lists soil pH as acidic (below 6.0), tolerating neutral (6.0–8.0), with good drainage and consistent moisture. The plant tolerates a range of soil textures — clay, loam, or sand — as long as drainage is adequate.
An aroid mix with bark, perlite, and coco coir provides the aeration the corms need — standard dense potting mix holds too much water against the corm and promotes the root rot that triggers dramatic drooping and die-back.
Repot every 1–2 years in spring, moving up one pot size when roots circle the bottom of the pot. Terracotta pots are appropriate for Alocasia — the faster drying-out prevents the corm from staying saturated. Ceramic or plastic pots retain moisture longer and increase overwatering risk with this genus.
Temperature
Daytime 68–77°F (20–25°C) per NC State. Bring indoors before frost. MBG advises 60–65°F as the overwintering target if the plant is going semi-dormant.
Pet safety
Toxic to cats and dogs per the ASPCA. The toxic principle is insoluble calcium oxalates — needle-like crystals that cause immediate painful oral irritation, drooling, and vomiting on contact or ingestion. NC State also notes the sap causes contact dermatitis. Place out of reach of pets and children, and wear gloves when repotting if you have sensitive skin.
Common problems
| Symptom | Likely cause | Fix |
|---|---|---|
| Fine webbing under leaves, stippled yellowing | Spider mites — the most common Alocasia indoor pest per MBG and NC State | Increase humidity; wipe undersides of leaves with damp cloth; spray with neem or insecticidal soap weekly until cleared |
| Yellowing leaves with mushy stems | Root rot from overwatering per NC State | Unpot, inspect corm, trim rotten roots, repot in airy aroid mix — see root rot guide |
| Brown crispy edges | Low humidity or salt buildup | Pebble tray or humidifier; flush pot with extra water once a quarter |
| Plant drops all leaves in winter | Dormancy — the corm is conserving energy | Keep barely moist in a 60–65°F spot; do not assume the plant is dead until you check the corm |
| White cottony deposits in leaf axils | Mealybugs or aphids per NC State | Remove manually with alcohol swab; treat with neem oil weekly |
Propagation
Alocasia propagates by division of offsets (pups) and by separating corms, per NC State Extension. Spring is the best time — the plant is entering active growth and establishes divisions quickly.
To propagate from offsets: when repotting, look for small pup plants emerging at the base of the main stem or at the soil surface. Gently separate each pup from the parent, ensuring it has some roots and at least one leaf. Pot individually into slightly moist aroid mix and keep in warm (68–75°F), high-humidity conditions out of direct sun. Roots establish within 3–5 weeks, and new leaf growth follows.
Corms can also be separated during repotting — the small tuber-like corms found in the soil can be planted just below the soil surface in moist mix and will sprout new plants within 4–8 weeks at temperatures above 68°F. This method has a lower success rate than offset division but is useful when the main plant is diseased and the corms are the only healthy material.
What gets misreported
"Amazonica" is the most common misreport in this genus. The name suggests an Amazon River origin — it has no such connection. The hybrid was created in Miami in the 1950s from two Southeast Asian parent species, per Kew POWO. 'Polly' is a compact cultivar of that hybrid with puckered leaves; the original 'Amazonica' has smoother leaves. They're the same hybrid lineage, sized differently.