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Plant guideCalathea care: the complete guide
Guidance verified against North Carolina State Extension Gardener Plant Toolbox and the ASPCA on 6 September 2026. Sources linked below.
Calathea wants medium to bright indirect light, soil kept evenly moist without ever turning soggy, humidity above 50 percent, and only distilled, rain or rested tap water, since tap-water fluoride burns its leaf tips. It is non-toxic to cats and dogs, and the reason its leaves fold upright every night, the "praying" look it is named for, is a hinge-like joint at the base of each leaf, not a sign the plant is struggling.
| Attribute | What a calathea needs |
|---|---|
| Light | Medium to bright indirect light; no direct sun, which fades leaf patterns and scorches leaves |
| Water | Evenly moist soil at all times, never soggy or bone dry; distilled, rain or rested tap water only |
| Humidity | 50 to 60% or higher; the most demanding requirement of any plant on this site |
| Soil / pot | Moist, well-drained, peat-based mix with added perlite or vermiculite; pot with drainage holes |
| Fertiliser | Balanced liquid fertiliser monthly during spring and summer; none in autumn or winter |
| Temperature | 65 to 75°F (18 to 24°C); no cold drafts below about 60°F (15.5°C) |
| Toxicity | Non-toxic to cats and dogs (ASPCA) |
How much light does a calathea need?
Calathea does best in medium to bright indirect light, and should never sit in direct sun, per North Carolina State Extension. Direct sunbeams fade the bold leaf patterns calathea is grown for and can scorch the leaf tissue outright. A spot a few feet back from an east- or north-facing window, or filtered light near a brighter window, suits it well. Too little light will not kill a calathea quickly, but growth slows and the patterning dulls; the general light guide covers reading a room's light level for other plants too.
How often should you water a calathea?
Keep the soil evenly moist at all times, watering again once the top inch starts to dry, and never let the pot dry out completely. This is a different rhythm from most foliage houseplants, which prefer drying out somewhat between waterings: calathea is one of the "moisture-lovers" that wants consistency rather than a dry-then-soak cycle, per the general watering guide's by-plant-type table. The water itself matters as much as the schedule: North Carolina State Extension is explicit that calathea should be watered with distilled water or rainwater, since ordinary tap water contains fluoride that browns the leaves. Tap water left standing uncovered overnight, which lets some chlorine dissipate, is a workable substitute if distilled or rainwater is not available, though it does nothing for fluoride or dissolved mineral salts.
What soil and pot does a calathea need?
Use a moist, well-drained, peat-based potting mix with added perlite or vermiculite for drainage, in a pot with drainage holes, per North Carolina State Extension. The mix needs to hold onto moisture, unlike the gritty, fast-draining mixes succulents want, while still draining freely enough that the roots are never sitting in standing water. The general soil and pot guide covers mix types and pot sizing for other houseplants; calathea sits toward the moisture-retentive end of that range, closer to peace lily than to a succulent.
Does a calathea need humidity?
Yes, and more than almost any other common houseplant: calathea wants 50 to 60 percent relative humidity or higher, with some species preferring 60 to 70 percent, per North Carolina State Extension's species pages. That puts it well above the 40 to 60 percent most houseplants tolerate, covered in the general humidity guide, and above what a heated or air-conditioned home typically holds. A pebble tray, grouping plants together, or a small humidifier near the plant all help; a doorless bathroom with a bright window is one of the few rooms in an ordinary home that reaches calathea's preferred range on its own.
How and when do you fertilise a calathea?
Feed monthly during spring and summer with a balanced liquid houseplant fertiliser diluted per the label, and stop through autumn and winter when growth slows and the plant cannot use the extra nutrients. Calathea's fine, shallow root system is easily burned by over-fertilising, which shows up as the same brown, crispy leaf edges caused by tap-water minerals, so when in doubt, feed less rather than more. The general fertilising guide covers dilution rates and spotting salt build-up in the soil.
What temperature does a calathea need?
Calathea is comfortable between about 65 and 75°F (18 to 24°C), close to the warm, stable understory conditions of its native tropical rainforest floor, per North Carolina State Extension. Avoid cold drafts from windows or doors below about 60°F (15.5°C), and keep it away from air-conditioning vents and sudden temperature swings, which stress this plant more than most. It cannot tolerate frost or near-freezing conditions at all. The general wilting guide covers cold shock and other temperature-related drooping in other houseplants.
How do you propagate a calathea?
Calathea is propagated by division, ideally done at repotting time in spring or summer: remove the plant from its pot, gently separate the root mass by hand into sections, making sure each section keeps its own roots and at least one full leaf, then pot each division into fresh, moist potting mix. Keep divisions warm, out of direct sun and in higher-than-usual humidity for two to three weeks while new roots establish, since a freshly divided calathea is more sensitive to stress than an established plant. The general propagation guide and repotting guide cover the same division method for other clumping houseplants.
Why are my calathea's leaves curling or turning brown?
Calathea has a reputation for being fussy, and most of that reputation traces back to just two causes:
| Symptom | Likely cause | Fix |
|---|---|---|
| Leaves curling inward and staying curled, often with crispy edges | Humidity below about 40 percent | Raise humidity with a pebble tray, grouping or a humidifier |
| Brown, crispy tips and edges that spread over time | Fluoride or dissolved mineral build-up from tap water | Switch to distilled water, rainwater or rested tap water |
| Faded or washed-out leaf pattern | Too much direct light | Move to medium or filtered indirect light |
| Yellowing lower leaves | Overwatering or the soil drying out completely between waterings | Check the soil stays evenly moist, never soggy or bone dry |
Leaves that curl upward each evening and flatten out again by morning are not a symptom at all, see the section below. See the general brown and crispy leaves and yellow leaves guides for the wider decision tree behind these symptoms on other houseplants.
Why does a calathea's leaves move throughout the day?
Calathea leaves open flat during the day to catch light and fold upward at night, a daily movement called nyctinasty. This is what gives the plant its common nickname of "prayer plant", shared with the closely related genus Maranta. What most care guides skip is the mechanism: a swollen, hinge-like joint called a pulvinus sits at the base of each leaf, and motor cells inside it pump potassium ions in and out on a roughly 24-hour rhythm, changing the water pressure inside the joint and physically bending the leaf. It is a change in water pressure, not growth, which is why the movement is fast enough to watch over an evening rather than taking days like ordinary growth would.
Same leaf, same joint: the pulvinus at the base of the leaf drives the daily fold, not new growth.
Nyctinasty is well documented across the wider prayer-plant family (Marantaceae) and the related legume family, and is generally understood to reduce night-time moisture loss and expose less leaf surface to nocturnal fungal spores and leaf-eating insects. A calathea that stops moving day to night, staying flat or staying folded regardless of the time, is usually a plant under enough stress (cold, severe underwatering, or shock after a big change) that its normal rhythm has broken down, worth treating as an early warning sign alongside the more visible symptoms in the table above.
Is calathea toxic to cats and dogs?
No. The ASPCA lists calathea as non-toxic to cats and dogs, making it one of the relatively few common, highly patterned foliage houseplants that is genuinely pet-safe rather than merely mild. It already appears on this site's own ASPCA-verified pet-safe plant list alongside spider plant, Boston fern and peperomia. Non-toxic does not mean unlimited: a pet that eats a large amount of any plant material, safe or not, can still vomit or get an upset stomach from bulk or fibre alone, so keeping any houseplant out of constant chewing range is still good practice.
FAQ
- How often should you water a calathea?
- Keep the soil evenly moist, watering again once the top inch starts to dry. Use distilled water, rainwater or rested tap water, since calathea is sensitive to tap-water fluoride.
- Is calathea toxic to cats and dogs?
- No. The ASPCA lists calathea as non-toxic to cats and dogs.
- Why does a calathea's leaves move throughout the day?
- A hinge-like joint called a pulvinus at the base of each leaf pumps ions in and out, changing water pressure and folding the leaf upright at night, a movement called nyctinasty.
- Why are my calathea's leaves curling or turning brown?
- Curling and brown edges almost always mean humidity below about 40 percent or tap-water fluoride and mineral build-up. Nightly curling that flattens by morning is normal.
Related guides
Sources
- North Carolina State Extension Gardener Plant Toolbox, Goeppertia (Calathea)
- North Carolina State Extension, Goeppertia rufibarba (Furry Feather Calathea)
- North Carolina State Extension, Goeppertia ornata (Pinstripe Calathea)
- Mechanism of the Pulvinus-Driven Leaf Movement: An Overview (peer-reviewed review)
- ASPCA, Toxic and Non-toxic Plants: Calathea