Anthurium Kunthii (Kunth's Anthurium) care

Light

In the wild anthurium kunthii grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Bright, filtered light suits its understory origin. An east window or a few feet back from a south/west window is ideal. Direct midday sun scorches the strap leaves; deep shade slows growth and weakens leaf substance. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for when the top 3-4 cm of mix is dry, roughly every 5-9 days for anthurium kunthii, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water thoroughly until it drains, then let the surface dry before repeating. As an epiphyte it hates standing water, so empty saucers promptly. Reduce frequency in winter. Use rainwater or filtered water; it is sensitive to salt buildup.

Soil and pot

Anthurium Kunthii grows best in chunky, airy epiphytic aroid mix. Use a free-draining blend of orchid bark, perlite, coco chips and a little peat or coir, plus charcoal. The roots need air, so never plant in dense, water-retentive potting soil. Aim for pH around 5.5-6.5. 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

Anthurium Kunthii sits happiest at around 60-80% humidity and 18-29°C (65-84°F). As a rainforest epiphyte it wants consistently high humidity. Below 50% leaf tips brown and new growth deforms. A pebble tray, grouping, or humidifier helps; a covered cabinet or terrarium gives the best results. 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 anthurium kunthii sparingly. Feed every 4-6 weeks in spring and summer with a balanced, dilute (quarter-to-half strength) liquid fertiliser. Anthuriums are sensitive to salt, so flush the mix occasionally and stop feeding in winter when growth slows. 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 anthurium kunthii in the Growli community. Each is annotated with the most common cause so you know where to start.

• Brown leaf tips and edges — Usually low humidity or salt and fluoride buildup from tap water. Raise humidity above 60% and switch to rain or filtered water; flush the mix periodically.
• Root rot — Caused by a dense, water-retentive mix or overwatering. Use a chunky epiphytic blend, let the surface dry between waterings and ensure the pot drains freely.
• Yellowing lower leaves — Often overwatering or natural aging. Check that roots are firm and white; adjust watering and confirm drainage if multiple leaves yellow at once.
• Stalled, small new growth — Typically too little light, low warmth or depleted feed. Move to brighter indirect light, keep above 18°C and resume dilute feeding in the growing season.

Propagation

Propagate by division of clumps or offsets when repotting, ensuring each division has roots and at least one growth point. Stem sections with aerial roots can also be rooted in a chunky, humid medium. Seed is slow and rarely practical at home. 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

Anthurium Kunthii is toxic to pets. The ASPCA lists Anthurium as toxic to cats and dogs. Like all anthuriums it contains insoluble calcium oxalate crystals; chewing causes oral pain, drooling, intense mouth and tongue irritation, difficulty swallowing and vomiting. Keep away from pets and children. 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.

Anthurium Kunthii deep-dive guides

Every aspect of anthurium kunthii care, each with its own calibrated guide:

• Anthurium Kunthii watering schedule
• Anthurium Kunthii light requirements
• Best soil mix for anthurium kunthii
• Anthurium Kunthii fertilizing guide
• When to repot anthurium kunthii
• How to propagate anthurium kunthii
• Anthurium Kunthii growth rate & size
• Anthurium Kunthii cold hardiness
• Anthurium Kunthii temperature & humidity
• Is anthurium kunthii toxic to cats & dogs?
• Is anthurium kunthii toxic to cats?
• Is anthurium kunthii toxic to dogs?

Featured in these plant shortlists

Anthurium Kunthii qualifies for 3 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.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Anthurium Kunthii is also commonly called Kunth's Anthurium or Long-Leaf Anthurium.

• Types of anthurium — 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 3899 plant care guides in the Growli library