Alexandra Palm (northern bangalow palm) care

Light

Bright but filtered. Alexandra Palm burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright filtered light or partial sun when young; mature plants take full sun in humid tropics. Indoors, place at a bright window. Harsh dry afternoon sun scorches juveniles, so acclimatise gradually. 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 alexandra palm: keep evenly moist; water when the top 2-3 cm of soil is dry, roughly every 4-7 days in 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 rainforest palm that hates drying out fully but also resents waterlogging. Water deeply, let the surface barely dry, and reduce in cool months. Brown frond tips often signal underwatering or dry air.

Soil and pot

Alexandra Palm grows best in rich, moisture-retentive but free-draining loam. Use a fertile potting mix with added compost and coarse grit or perlite for drainage. Slightly acidic to neutral pH. Outdoors, a deep humus-rich soil that holds moisture yet never sits soggy is ideal. 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

Alexandra Palm sits happiest at around 50-70% humidity and 18-30°C (65-86°F). A true rainforest palm that prefers high humidity. Indoor air below 40% causes brown tips and spider mites. Group plants, use a pebble tray or humidifier, and avoid drying heat vents. 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 alexandra palm sparingly. Feed monthly through spring and summer with a balanced palm fertiliser containing magnesium, potassium and micronutrients. Palms are prone to potassium and magnesium deficiency (yellowing, frizzled older fronds). Halve or stop feeding 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 alexandra palm in the Growli community. Each is annotated with the most common cause so you know where to start.

• Brown frond tips — Low humidity, dry air or underwatering. Raise humidity and keep the rootball evenly moist.
• Yellowing older fronds — Often potassium or magnesium deficiency. Use a complete palm fertiliser with micronutrients.
• Spider mites — Thrive in hot dry indoor air. Inspect frond undersides, rinse foliage and raise humidity.
• Cold damage — Frost blackens fronds and can kill the growing point. Keep above 10°C and protect from cold draughts.

Propagation

Propagated only from fresh seed, which germinates readily but slowly in warm (25-30°C) moist conditions over several weeks to months. As a solitary palm it cannot be divided or grown from cuttings. 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

Alexandra Palm is mildly toxic to pets. Archontophoenix is not individually listed by the ASPCA, which classifies true palms such as areca and parlor palm as non-toxic; this species shares no recognised toxic principle. Treat as low-risk but uncertain, watch for mild GI upset if fronds or fruit are chewed, and verify with a vet. Do not confuse with the genuinely toxic sago palm (a cycad). 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.

Alexandra Palm deep-dive guides

Every aspect of alexandra palm care, each with its own calibrated guide:

• Alexandra Palm watering schedule
• Alexandra Palm light requirements
• Best soil mix for alexandra palm
• Alexandra Palm fertilizing guide
• When to repot alexandra palm
• How to propagate alexandra palm
• Alexandra Palm growth rate & size
• Alexandra Palm cold hardiness
• Alexandra Palm temperature & humidity
• Is alexandra palm toxic to cats & dogs?
• Is alexandra palm toxic to cats?
• Is alexandra palm toxic to dogs?

Featured in these plant shortlists

Alexandra Palm 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.
• 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

Alexandra Palm is also commonly called Alexandra palm or northern bangalow palm.

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