Calathea Burle-Marxii (ice blue calathea) care

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness calathea burle-marxii grows fastest in. Bright, indirect light suits it best; tolerates lower light better than many calatheas. Keep out of direct sun, which scorches the thin leaves and fades the markings. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for when the top 2-3 cm of soil is just dry, roughly every 5-7 days in growth for calathea burle-marxii, 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. Maintain even moisture without sogginess. Use rainwater, distilled or filtered water; hard or fluoridated tap water browns the margins. Let watering taper off through the cooler months.

Soil and pot

Calathea Burle-Marxii grows best in light, moisture-retentive aroid-style mix. Peat-free coir or fine bark with perlite and a little compost keeps the rootball damp yet airy. Target a slightly acidic pH near 6.0-6.5 and always pot into a container with drainage. 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

Calathea Burle-Marxii sits happiest at around 60-80% humidity and 18-27°C (65-80°F). Loves it humid. A pebble tray, plant grouping or humidifier keeps the foliage pristine; below roughly 50% the edges crisp. A bright bathroom or terrarium-style spot is ideal. 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 calathea burle-marxii sparingly. Feed every 4 weeks in spring and summer with a balanced liquid houseplant feed diluted to half strength. Flush the pot periodically to clear salts, and stop feeding over autumn and 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 calathea burle-marxii in the Growli community. Each is annotated with the most common cause so you know where to start.

• Browning leaf margins — The classic calathea response to hard water and dry air. Water with rainwater or distilled water and raise ambient humidity above 50%.
• Drooping or rolled leaves — Signals thirst or low humidity; persistent droop can mean cold or root rot from waterlogging. Check soil moisture and root health.
• Yellowing lower leaves — Often overwatering and poor drainage. Let the top layer dry slightly between waterings and confirm the pot drains freely.
• Spider mites and thrips — Sap-suckers thrive in dry air, causing stippling and silvering. Increase humidity, wipe leaves and apply insecticidal soap or neem if infestation appears.

Propagation

Divide the rhizome clump in spring, ideally at repotting. Separate sections each bearing roots and several leaves, pot individually in fresh mix, and keep warm, humid and lightly shaded while they recover. 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

Calathea Burle-Marxii is pet-safe. ASPCA-listed as non-toxic to cats and dogs. As a member of the prayer-plant family Marantaceae (Calathea/Goeppertia), it carries no calcium oxalates or other toxic principles per ASPCA classification. Ingesting large amounts of foliage may still cause minor, short-lived digestive upset. 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.

Calathea Burle-Marxii deep-dive guides

Every aspect of calathea burle-marxii care, each with its own calibrated guide:

• Calathea Burle-Marxii watering schedule
• Calathea Burle-Marxii light requirements
• Best soil mix for calathea burle-marxii
• Calathea Burle-Marxii fertilizing guide
• When to repot calathea burle-marxii
• How to propagate calathea burle-marxii
• Calathea Burle-Marxii growth rate & size
• Calathea Burle-Marxii cold hardiness
• Calathea Burle-Marxii temperature & humidity
• Is calathea burle-marxii toxic to cats & dogs?
• Is calathea burle-marxii toxic to cats?
• Is calathea burle-marxii toxic to dogs?

Featured in these plant shortlists

Calathea Burle-Marxii qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• 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 pet-safe low-light plants — Non-toxic to cats and dogs AND happy with no direct sun — the two hardest constraints to satisfy at once.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• Best pet-safe bathroom plants — Non-toxic to cats and dogs and happy in the humid, lower-light conditions of a bathroom — safe greenery for the smallest room.
• Best pet-safe bedroom plants — Non-toxic to cats and dogs and happy in lower light — calming greenery for a bedroom where a pet often sleeps too.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Calathea Burle-Marxii is also commonly called ice blue calathea or Burle Marx's calathea.

• Types of calathea — varieties identified, with care and pet-safety
• Snake plant care — light, water and common problems
• Dracaena care — light, water and common problems
• Peperomia care — light, water and common problems
• All 2464 plant care guides in the Growli library