Calathea plant leaves curling?
Curling calathea leaves usually mean the plant is losing water faster than the roots can replace it, often from dry soil, heat, sun, or stressed roots.
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The causes in full
Dry soil from missed wateringMOST COMMON
How to tell
The soil is dry two inches down or has pulled away from the pot, the pot feels light, and leaves may curl inward all over but are not soft or mushy.
What to do
If the soil is dry two inches down, water slowly until water runs from the drainage holes, then empty any outer pot or saucer. If the root ball is bone dry and pulling from the pot, soak the pot in a bowl of water for 20 to 30 minutes, then drain it fully.
Hot sun or dry air near the windowCOMMON
How to tell
The curling is worst on the window side or after sunny days, and the leaf edges may feel crisp even when the soil is still damp.
What to do
Move the plant out of direct sun through glass and away from heaters or vents, keeping it in bright but indirect light. Water only if the soil is dry two inches down; do not water just because the leaves are curled if the soil is still damp.
Overwatering or poor drainageCOMMON
How to tell
The soil is soggy or stays damp for many days, the pot may sit in water or have poor drainage, and older leaves may curl, yellow, or feel limp.
What to do
If the soil is soggy or wet two inches down, withhold water until the top two inches are just barely damp, and empty any standing water from the saucer or cover pot. If the pot has no drainage holes or the mix smells sour, repot into a pot with drainage using a loose indoor potting mix.
Cold draught or temperature shockLESS COMMON
How to tell
Curling appears quickly after a cold night, an open window, a door draught, or air conditioning, often on the side facing the glass or moving air.
What to do
Move the plant away from cold glass, draughty doors, and air-conditioning flow, especially overnight. If the soil is dry two inches down, water normally; if it is damp or wet, let it dry to just barely damp before watering again.
Spider mites or thripsLESS COMMON
How to tell
Check the undersides of curled leaves and new growth for fine webbing, pale speckles, silvery streaks, tiny moving dots, or black specks of pest droppings.
What to do
Isolate the plant, rinse both sides of the leaves, and wipe them clean; repeat every few days while you keep checking for pests. If pests are still present, use a labelled insecticidal soap or horticultural oil on this plant, following the label and keeping it out of direct sun while treated.
Fertilizer, spray, or mineral-salt damageRARE
How to tell
This is more likely if curling began soon after feeding, using a leaf spray or pest spray, or watering repeatedly with hard water, especially with crust on the soil or brown leaf edges.
What to do
If the soil is damp but not soggy, flush the pot once with plenty of filtered, rain, or distilled water and let it drain completely; if the soil is soggy, wait until it is only damp before flushing. Stop fertilizing and avoid leaf-shine or homemade sprays until new growth looks normal.
Will it recover?
Leaves curled from thirst or temperature shock may partly uncurl, but crispy, yellowed, or pest-damaged leaves will not fully repair and the goal is healthy new growth.
Stopping it happening again
Keep calatheas in bright indirect light, use a pot with drainage, water only when the top two inches are starting to dry, and keep them away from direct sun, cold glass, and draughts.
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