Arisaema jacquemontii (Jacquemont's cobra lily) care

Light

Arisaema jacquemontii is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Dappled shade to part shade, as in its alpine-woodland habitat. Morning sun with afternoon shade is ideal; it dislikes hot, dry, full sun, which scorches the leaf and dries the tuber. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water arisaema jacquemontii keep evenly moist in spring and summer growth; allow to dry as the leaf dies back in late summer. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Water through the active season so the soil stays cool and moist but never waterlogged. Once the foliage yellows, reduce watering and let the dormant tuber rest on the drier side over winter.

Soil and pot

Arisaema jacquemontii grows best in cool, humus-rich, free-draining woodland soil. A leafy, moisture-retentive but sharply drained loam suits it best. Add leaf mould and grit; the tuber rots in heavy, wet winter ground, so improve drainage on clay soils. 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

Arisaema jacquemontii sits happiest at around 50-70% humidity and 5-25°C (41-77°F). Cool, moist mountain air suits it; outdoor humidity is usually sufficient. If grown under glass, provide good air movement and moderate humidity to prevent rot. If you keep the room above 5 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 arisaema jacquemontii sparingly. Apply a mulch of leaf mould in spring and feed once or twice during active growth with a balanced liquid fertiliser. Avoid heavy feeding, which can encourage soft growth and rot. 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 arisaema jacquemontii in the Growli community. Each is annotated with the most common cause so you know where to start.

• Tuber rot — Cold, waterlogged winter soil rots the dormant tuber. Plant on a well-drained site or raised bed and improve heavy ground with grit and leaf mould.
• Late frost damage — Although hardy, emerging spring shoots can be nipped by late frosts. Mulch the crown and protect new growth on cold nights.
• Slug and snail damage — Soft emerging shoots and leaves are grazed by slugs and snails. Use barriers or wildlife-safe controls as growth appears.
• Leaf scorch — Too much hot, direct sun browns the leaf and dries the tuber. Site it in dappled or afternoon shade.

Propagation

Propagate by separating offset tubers in autumn while dormant, or from fresh seed (cleaned of pulp), which is slow to reach flowering size. Wear gloves when handling tubers, as the sap can irritate skin. 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

Arisaema jacquemontii is toxic to pets. Arisaema species are toxic to cats and dogs. The ASPCA lists the closely related Arisaema triphyllum (jack-in-the-pulpit) as toxic, with insoluble calcium oxalates as the toxic principle; the genus, including A. jacquemontii, shares this chemistry. Ingestion causes oral pain and swelling of the mouth, tongue and lips, excessive drooling, difficulty swallowing and vomiting. Keep away from pets and consult a vet if chewed. 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.

Arisaema jacquemontii deep-dive guides

Every aspect of arisaema jacquemontii care, each with its own calibrated guide:

• Arisaema jacquemontii watering schedule
• Arisaema jacquemontii light requirements
• Best soil mix for arisaema jacquemontii
• Arisaema jacquemontii fertilizing guide
• When to repot arisaema jacquemontii
• How to propagate arisaema jacquemontii
• Arisaema jacquemontii growth rate & size
• Arisaema jacquemontii cold hardiness
• Arisaema jacquemontii temperature & humidity
• Is arisaema jacquemontii toxic to cats & dogs?
• Is arisaema jacquemontii toxic to cats?
• Is arisaema jacquemontii toxic to dogs?
• Getting arisaema jacquemontii to bloom

Featured in these plant shortlists

Arisaema jacquemontii qualifies for 5 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.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• 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 houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

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Arisaema jacquemontii is also commonly called Jacquemont's cobra lily or high-altitude arisaema.

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