Alocasia Macrorrhizos Giant Upright (Giant Upright elephant ear) care

Light

Bright but filtered. Alocasia Macrorrhizos Giant Upright burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright, indirect to filtered direct light. Outdoors in the tropics it takes considerable sun with ample water; indoors give the brightest spot short of harsh midday rays, which can scorch the huge leaves. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering alocasia macrorrhizos giant upright: when the top 2-3 cm of soil dries, often every 4-6 days in active growth. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. A thirsty plant that likes consistently moist soil and tolerates damp conditions better than smaller Alocasia, but still needs drainage. Reduce in winter, as cold waterlogged soil rots the large rhizome.

Soil and pot

Alocasia Macrorrhizos Giant Upright grows best in rich, moisture-retentive, well-drained loam or aroid mix. Use a fertile, humus-rich mix that holds moisture yet drains; add compost plus perlite or bark for structure. Heavy, fast-draining-but-poor soils limit its size and vigour. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Alocasia Macrorrhizos Giant Upright sits happiest at around 60-90% humidity and 20-30°C (68-86°F). Thrives in high humidity and warm, moist air. Indoors, dry air browns the leaf margins of the large blades, so a humidifier or grouping helps; it performs best outdoors in suitable climates or a conservatory. If you keep the room above 20 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed alocasia macrorrhizos giant upright sparingly. A heavy feeder: fertilise every 1-2 weeks in the growing season with a balanced or higher-nitrogen liquid feed, or use slow-release granules plus rich organic matter. Taper off in autumn and stop in winter. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on alocasia macrorrhizos giant upright in the Growli community. Each is annotated with the most common cause so you know where to start.

• Root rot in cold, wet soil — The large rhizome rots when cold and waterlogged. Keep it warm, use a mix that drains, and cut watering back sharply over winter.
• Leaf scorch — Harsh direct midday sun on the big blades causes bleaching and brown patches. Give bright filtered light and ensure the soil stays moist in strong sun.
• Browning leaf edges from low humidity — Dry indoor air crisps the margins of the large leaves. Raise humidity with a humidifier or grouping, ideally grow outdoors or in a conservatory.
• Spider mites and scale — Dry, stressed plants attract mites and scale on the big leaf surfaces. Inspect undersides, wipe leaves, raise humidity, and treat with insecticidal soap or neem.

Propagation

Propagate by division of the rhizome or by separating basal offsets in spring. Cut a rhizome section or detach a pup with roots and a growth point, then pot into warm, rich, moist soil and keep humid until established. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Alocasia Macrorrhizos Giant Upright is toxic to pets. ASPCA lists Alocasia as toxic to cats, dogs and horses. All parts contain insoluble calcium oxalate crystals; chewing causes severe oral irritation, intense burning, drooling, vomiting and oral swelling that can impair swallowing or breathing. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Alocasia Macrorrhizos Giant Upright deep-dive guides

Every aspect of alocasia macrorrhizos giant upright care, each with its own calibrated guide:

• Alocasia Macrorrhizos Giant Upright watering schedule
• Alocasia Macrorrhizos Giant Upright light requirements
• Best soil mix for alocasia macrorrhizos giant upright
• Alocasia Macrorrhizos Giant Upright fertilizing guide
• When to repot alocasia macrorrhizos giant upright
• How to propagate alocasia macrorrhizos giant upright
• Alocasia Macrorrhizos Giant Upright growth rate & size
• Alocasia Macrorrhizos Giant Upright cold hardiness
• Alocasia Macrorrhizos Giant Upright temperature & humidity
• Is alocasia macrorrhizos giant upright toxic to cats & dogs?
• Is alocasia macrorrhizos giant upright toxic to cats?
• Is alocasia macrorrhizos giant upright toxic to dogs?

Featured in these plant shortlists

Alocasia Macrorrhizos Giant Upright qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Alocasia Macrorrhizos Giant Upright is also commonly called Giant Upright elephant ear or upright giant taro.

• Types of alocasia — varieties identified, with care and pet-safety
• Monstera care — light, water and common problems
• Pothos care — light, water and common problems
• Fiddle leaf fig care — light, water and common problems
• All 2464 plant care guides in the Growli library