Prayer plant leaves turning yellow?

On a prayer plant, yellow leaves usually mean water stress from soil staying too wet or getting too dry; one oldest lower leaf yellowing slowly can be normal turnover.

Answer what you can see

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Push a finger two inches into the soil. What does it feel like?

Which leaves are affected?

Where does it live?

How fast did this happen?

Some causes can share the same answers and cannot be told apart from yellow color alone: overwatering and low light both fit damp or soggy soil with lower or all-over yellowing over weeks to months, and sun or cold stress can overlap with pest or spray damage on the window-facing side, so use the confirm checks before acting.

The causes in full

Waterlogged soil or poor drainageMOST COMMON

How to tell
Check for soil that is soggy or still damp many days after watering, a heavy pot, water in the saucer, no drainage hole, or soft dark roots if you slide the root ball out.

What to do
If the soil is soggy or wet, stop watering until the top 1 inch of soil feels dry, empty the saucer, and make sure the pot has drainage holes. If roots are mushy or the mix smells sour, repot into fresh airy potting mix and then water only when the top 1 inch feels dry.

Soil getting too dry between wateringsCOMMON

How to tell
The pot feels light, the soil is dry and crumbly or pulling away from the pot, and leaves may look limp before they yellow.

What to do
If the top 1 inch of soil feels dry, water thoroughly until water runs from the drainage holes, then empty the saucer. If the soil has pulled away from the pot, water in stages over 10 to 20 minutes so the mix actually re-wets, but only do this when the top 1 inch is dry.

Low light keeping the plant weak and the mix wetCOMMON

How to tell
It is in a dim corner or several feet from the window, new growth is small or sparse, and the pot stays damp for a long time.

What to do
Move it to bright indirect light, such as near a window with no direct midday sun. If the soil is damp or soggy, do not water again until the top 1 inch feels dry.

Direct sun through glass or cold window shockLESS COMMON

How to tell
Yellowing, bleaching, or crispy patches are worst on the side facing the window, or the plant sits against cold glass or in a draught.

What to do
Move the plant out of direct sun and away from cold glass, heaters, and draughts, keeping it in bright indirect light. If the top 1 inch of soil feels dry after the move, water thoroughly; if it is still damp, wait.

Spider mites, scale insects, or fertilizer/spray burnLESS COMMON

How to tell
Look under leaves and along stems for fine webbing, pale speckling, sticky spots, small brown bumps, or yellowing that began soon after feeding or spraying the leaves.

What to do
For pests, wipe leaves and stems, then use a labeled insecticidal soap or horticultural oil, not dish soap, repeating as directed. For recent fertilizer or spray damage, stop feeding or spraying, remove any visible fertilizer crust, and resume plain watering only when the top 1 inch of soil feels dry.

Normal oldest-leaf turnoverLESS COMMON

How to tell
Only one or two of the oldest, lowest leaves are yellowing slowly while the rest of the plant is firm and making healthy new leaves.

What to do
If the top 1 inch of soil feels dry, keep your normal watering routine; if it is still damp, wait. Trim off the fully yellow leaf once it is easy to remove, but do not make a big care change for a single old leaf.

Will it recover?

Yellow prayer plant leaves usually do not turn green again; the goal is to stop the cause and get healthy new growth.

Stopping it happening again

Keep the plant in bright indirect light, in a pot with drainage, away from direct hot sun and cold draughts, and water when the top 1 inch of soil feels dry.