Why is my Calathea not praying?

Your Calathea is most likely not praying because it is not getting enough light. The leaf raising and lowering, called nyctinasty, is triggered by light levels, so a plant in a dim spot stays flat even when it is otherwise healthy. Move it to bright, indirect light, keep watering and humidity consistent, and the nightly folding usually returns within one to two weeks.

Most likely cause

Insufficient light is the top reason a Calathea stops praying. The movement is a light-driven response, so when there is too little light, the plant gets little signal to raise and lower its leaves. This is why Calatheas in low-light corners often sit flat both day and night.

To confirm, check the spot at midday. If you would struggle to read a book there without a lamp, it is too dark. A healthy Calathea wants bright, indirect light, for example an east-facing window or a few feet back from a brighter one. After moving it somewhere brighter, watch for movement to resume over the next one to two weeks.

Other causes

Ranked after light, these are the next things to check.

Inconsistent or under-watering. How to tell: the top inch of soil is bone dry, or the leaves curl and crisp at the edges. Calatheas want evenly moist, never soggy, soil.
Low humidity. How to tell: leaf edges turn brown and the plant lives in dry indoor air below roughly 50 percent humidity.
Temperature stress. How to tell: the plant sits near a cold draft, a heater, or an AC vent, or rooms drop below 60F (15C).
Normal timing. How to tell: leaves are up at night and lowered by day. That is healthy behavior, not a problem.

How to fix it

Move the plant to bright, indirect light, such as near an east-facing window or a few feet from a south or west one. Avoid harsh direct midday sun.
Water when the top inch of soil dries, watering until it drains from the bottom, then empty the saucer. Keep the schedule consistent.
Raise humidity to 50 percent or higher using a humidifier, a pebble tray, or by grouping plants together.
Keep temperatures between 65F and 80F (18C to 27C) and away from drafts, heaters, and vents.
Wait one to two weeks. With stable conditions and new growth, the praying motion returns.

Symptom	Likely cause
Flat leaves day and night	Insufficient light
Curling leaves, dry soil	Under-watering
Browning, crispy leaf edges	Low humidity
Drooping after a cold spell	Temperature stress
Leaves up at night, down by day	Normal praying cycle

Frequently asked questions

Do Calatheas always pray every night?

Healthy Calatheas fold their leaves up most evenings and lower them by day. An occasional quiet night is normal, but a plant that never moves usually needs more light.

Can too much light stop a Calathea from praying?

Yes. Harsh direct sun can stress the plant and disrupt movement, but far more Calatheas under-pray from too little light than from too much.

How long until my Calathea prays again after I fix the problem?

Once light and watering are corrected, most plants resume noticeable movement within one to two weeks as they adjust and put out new growth.

Is a Calathea that stopped praying dying?

Not usually. Flat leaves are an early stress signal, not a death sentence. Correct the light, watering, and humidity and the movement typically returns.

Does praying run on a strict day-night clock?

Movement is driven mainly by light levels, not a rigid internal clock, so a dim room can suppress it even in the middle of the day.

Will a new Calathea pray right after I bring it home?

It may pause for a week or two while adjusting to new light and humidity. Give it a stable, bright spot before assuming something is wrong.