Aztec Lily (Jacobean lily) care

Light

Most houseplants will scorch where aztec lily thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is essential — a south- or west-facing windowsill or unshaded glasshouse bench produces the best flowering; insufficient light leads to lush foliage but no blooms. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for regular watering while in active growth; keep dry during autumn–winter dormancy for aztec lily, 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 when the top 2 cm of compost dries out during the growing season, then gradually reduce watering as leaves yellow in autumn and stop entirely through winter dormancy.

Soil and pot

Aztec Lily grows best in fertile, well-drained sandy loam, ph 7.0–7.8. Plant the bulb with the neck just above the compost surface in a pot only slightly wider than the bulb; use a loam-based mix with added grit. Aztec lily flowers best when slightly pot-bound, so repot only every three to four years. 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

Aztec Lily sits happiest at around Low to moderate (40–60%) humidity and 7–25°C (45–77°F). Tolerates the relatively low humidity of heated interiors but benefits from good ventilation; avoid misting the flowers, which bruise easily. If you keep the room above 7–25°C 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 aztec lily sparingly. Feed every two weeks with a balanced liquid fertiliser from leaf emergence until flowering; switch to a high-potassium feed after flowers fade to build up the bulb, then stop as leaves yellow. 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 aztec lily in the Growli community. Each is annotated with the most common cause so you know where to start.

• Failure to bloom — The most common complaint; caused by insufficient dormancy (bulbs need a dry, cool rest of at least eight to ten weeks), too much shade, or over-potting. Keep the bulb dry and slightly cool (7–10°C) through winter to trigger reliable flowering.
• Red blotch (Stagonospora curtisii) — A fungal disease common in Amaryllidaceae bulbs causing red streaks and lesions on leaves and flower stems. Purchase clean, certified bulbs; discard severely infected material; avoid splashing water on leaves and crowding plants.

Propagation

Remove offsets (daughter bulbs) when repotting and pot them individually; they typically flower in two to three years. Seed propagation is slow and rarely used in cultivation. 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

Aztec Lily is toxic to pets. Sprekelia formosissima is a member of Amaryllidaceae and its bulbs have been confirmed to contain Amaryllidaceae alkaloids including lycorine, haemanthamine, and tazettine. Lycorine is the primary toxic principle in this plant family and is listed by the ASPCA as toxic in related amaryllid genera. Ingestion — especially of the bulb — can cause vomiting, diarrhoea, abdominal pain, hypersalivation, lethargy, and, in serious cases, tremors. Seek veterinary advice immediately. 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.

Aztec Lily deep-dive guides

Every aspect of aztec lily care, each with its own calibrated guide:

• Common aztec lily problems & fixes
• Aztec Lily watering schedule
• Aztec Lily light requirements
• Best soil mix for aztec lily
• Aztec Lily fertilizing guide
• When to repot aztec lily
• How to propagate aztec lily
• How to prune aztec lily
• What's eating my aztec lily?
• Aztec Lily growth rate & size
• Aztec Lily cold hardiness
• Aztec Lily temperature & humidity
• Is aztec lily toxic to cats & dogs?
• Is aztec lily toxic to cats?
• Is aztec lily toxic to dogs?
• Getting aztec lily to bloom

Featured in these plant shortlists

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

• 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 full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• 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

Related guides

Aztec Lily is also known as Aztec lily, Jacobean lily, and Maltese cross lily.

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• All 10153 plant care guides in the Growli library