Colocasia Blue Hawaii (Blue Hawaii taro) care

Light

Bright but filtered. Colocasia Blue Hawaii burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Full sun to part shade outdoors; the more light it receives, the bolder the purple venation. Indoors give the brightest spot available, ideally a few hours of gentle direct sun. Deep shade washes out the dark markings and stretches the petioles. 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 colocasia blue hawaii: keep soil constantly moist; water every 2-4 days, daily in summer heat. 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 marginal bog plant that never wants to dry out. In summer it can even stand in a saucer of water. Reduce sharply in winter when growth slows. Wilting and brown leaf edges signal underwatering or low humidity.

Soil and pot

Colocasia Blue Hawaii grows best in rich, moisture-retentive loam. Heavy, humus-rich potting mix amended with compost; tolerates poorly draining ground far better than most plants. A mix that holds water yet stays open enough to avoid stagnation and tuber rot suits it best. 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

Colocasia Blue Hawaii sits happiest at around 50-80% humidity and 18-30°C (65-86°F). Loves high humidity; thin or browning leaf edges indicate dry indoor air. Group with other plants or run a humidifier. Outdoors in a sheltered, humid spot it performs best. If you keep the room above 18 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 colocasia blue hawaii sparingly. Heavy feeder during active growth. Apply a balanced liquid fertiliser every 2 weeks in spring and summer, or a slow-release granular at the start of the season. Stop feeding in autumn and through dormancy. 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 colocasia blue hawaii in the Growli community. Each is annotated with the most common cause so you know where to start.

• Browning leaf edges — Caused by dry air or letting the soil dry out; this is a bog plant, so keep it consistently moist and raise humidity.
• Faded purple venation — Too little light dulls the dark markings; move to brighter conditions to restore contrast.
• Spider mites — Dry indoor air invites mites that stipple and bronze leaves; raise humidity and rinse foliage, treating with insecticidal soap if needed.
• Tuber rot in winter — Cold, waterlogged soil during dormancy rots the corm; ease off watering and keep dormant tubers cool but not soggy.

Propagation

Divide the clump or separate offset cormlets in spring. Lift the parent corm, cut away pups with their own roots, and pot into rich moist mix. Stored dormant tubers can also be started in warmth. 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

Colocasia Blue Hawaii is toxic to pets. ASPCA lists Colocasia (elephant ear / taro) as toxic to cats and dogs. The toxic principle is insoluble calcium oxalate crystals; chewing causes oral pain, intense drooling, vomiting, and difficulty swallowing, with rare airway swelling. Keep away from pets and wash hands after handling sap. 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.

Colocasia Blue Hawaii deep-dive guides

Every aspect of colocasia blue hawaii care, each with its own calibrated guide:

• Colocasia Blue Hawaii watering schedule
• Colocasia Blue Hawaii light requirements
• Best soil mix for colocasia blue hawaii
• Colocasia Blue Hawaii fertilizing guide
• When to repot colocasia blue hawaii
• How to propagate colocasia blue hawaii
• Colocasia Blue Hawaii growth rate & size
• Colocasia Blue Hawaii cold hardiness
• Colocasia Blue Hawaii temperature & humidity
• Is colocasia blue hawaii toxic to cats & dogs?
• Is colocasia blue hawaii toxic to cats?
• Is colocasia blue hawaii toxic to dogs?

Featured in these plant shortlists

Colocasia Blue Hawaii 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 drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• 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.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Colocasia Blue Hawaii is also commonly called Blue Hawaii taro or Blue Hawaii elephant ear.

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• All 2464 plant care guides in the Growli library