How to Care for a Calathea (Prayer Plant)

Calatheas have a reputation as divas, and it's only half deserved. The bold-patterned leaves that make them irresistible in the shop are also an early-warning system: curl, crisp, or fade, and the plant is telling you exactly which part of its routine is off. Learn to read those signals and a Calathea is no harder than a fern. This guide covers the whole genus as sold in shops — Calathea orbifolia, C. ornata, C. makoyana, C. lancifolia (rattlesnake plant) and their close cousins the marantas — because they all want the same thing: a warm, humid, evenly moist life out of direct sun.

Light: bright, but never direct

In the wild these are understory plants, growing beneath a rainforest canopy. Indoors that translates to bright, indirect light — close to a north- or east-facing window, or a metre or two back from a brighter one. Direct midday sun bleaches the patterns and scorches the leaf edges; deep shade slows growth and dulls the markings. If the leaf pattern is fading to a washed-out green, it's getting too much light, not too little.

Watering: consistently moist, never soggy

This is the habit that separates happy Calatheas from crispy ones. Water when the top 1–2 cm of soil feels dry — usually every 5–7 days in summer and every 10–14 days in winter. The soil should stay lightly moist at all times, but the pot must drain freely; a Calathea sitting in a saucer of water will rot just like any other houseplant. If the root ball ever dries out completely, bottom-water: stand the pot in a few centimetres of water for 45 minutes so the compost rewets evenly.

Water quality matters more than you think

Calatheas are famously sensitive to the salts, chlorine, and fluoride in hard tap water. Those minerals accumulate in the soil and burn the leaf tips — the classic crispy brown edge that no amount of misting will fix. Use rainwater or filtered water if you can. If tap water is your only option, let it stand overnight before using it, and flush the pot through with generous water every couple of months to wash accumulated salts out of the drainage holes.

Humidity and temperature

• Aim for 50% humidity or more; 60%+ is where Calatheas visibly relax.
• Group plants together, use a pebble tray, or run a small humidifier — a bright bathroom or kitchen is prime Calathea territory.
• Keep temperatures between 18–27°C, and never below 15°C.
• Keep the plant away from radiators, air-conditioning vents, and cold draughts — moving dry air is the fastest way to brown a Calathea.

Soil, feeding, and repotting

Use a peat-free houseplant compost lightened with about a third perlite, so it holds moisture without waterlogging. Feed monthly through spring and summer with a balanced liquid fertiliser at half strength — Calatheas are light feeders, and overdoing it adds fertiliser salts to the very tap-water salts you're trying to avoid. Repot every couple of years in spring, one pot size up. This is also the moment to propagate: Calatheas don't grow from cuttings, but a mature clump divides easily into two or three plants at the roots.

Why do the leaves move?

A healthy Calathea folds its leaves upward at night and lowers them again at dawn — you can sometimes hear a soft rustle. This is nyctinasty, the same day–night rhythm the whole prayer-plant family shares, driven by a joint at the base of each leaf. Movement is a good sign; a Calathea that has gone completely still and stiff is usually thirsty.

Troubleshooting the classics

• Curling leaves: the soil got too dry, or the air is too dry. Check the pot first — curl is a Calathea's default thirst signal.
• Brown, crispy edges: tap-water minerals or low humidity. Switch water source before you change anything else.
• Yellow lower leaves: overwatering — let the top layer dry out and check drainage.
• Faded, washed-out pattern: too much direct light. Move it back from the window.
• Fine webbing and speckled leaves: spider mites, which love the dry air Calatheas hate. Raise humidity and treat promptly.

Pro tip: dust the leaves with a damp cloth every few weeks. Those broad leaves are the plant's entire solar panel array, and a layer of dust in a shady spot meaningfully cuts the light they can use.

Warning: don't use leaf-shine sprays on Calathea — they clog the leaf surface and often trigger the very browning they promise to prevent.

One more piece of good news: Calatheas and marantas are non-toxic to cats and dogs, which makes them one of the best statement plants for a pet household. And if yours is sulking and you can't tell which classic it's performing, photograph the worst leaf in PlantMe — the app matches the symptom pattern and tells you whether you're looking at thirst, tap water, or mites.