A peace lily droops when its leaves lose water faster than the roots deliver it. The plant is famous for it: the whole plant collapses over the pot rim when the soil dries, and stands back up within a few hours of a drink. That is the harmless version. The harmful version looks the same and happens with wet soil, because the roots have rotted and cannot take up the water around them. The other causes, cold, a recent move, hot sun and pests, produce a milder droop that resolves when the condition changes.
The first test is the pot. Lift it. A light pot with dry soil is thirst. A heavy pot with wet soil and a drooping plant is root trouble, and another watering makes it worse.
What the pot tells you
| What you see | Most likely cause | Check this first |
|---|---|---|
| Whole plant collapsed, pot light, soil dry, leaves still green | Underwatering | Soil two or three centimetres down |
| Drooping with wet soil days after watering, lower leaves yellow, stems dark at the base, sour smell | Overwatering and root rot | Root check |
| Drooping within days of a move or repot, soil neither wet nor dry | Shock | Wait a week with steady care |
| Drooping after a cold night by a window or door | Cold | Temperature at the leaf |
| Drooping in the afternoon in a bright window, leaves warm, soil moist | Heat and direct sun | Position |
| Drooping with sticky film, webbing or cottony spots | Pests | Undersides of leaves |
Underwatering
Peace lilies have thin leaves and a lot of them, and they lose water fast. When the soil dries out the leaves and flower stalks go limp within a day and the whole plant slumps. The soil is dry to the touch, the pot is light, and if it went dry for long the soil has shrunk away from the pot's edge.
What to do: water slowly and thoroughly until water runs from the drainage hole. If the soil has shrunk from the rim, stand the pot in a basin of room-temperature water for twenty to thirty minutes so the root ball rewets from below, then drain. The plant stands back up within a few hours.
Then stop using the collapse as a signal. Every collapse damages fine roots and browns a few leaf tips, and a peace lily that wilts weekly declines over a year: smaller leaves, more brown tips, fewer flowers. Check the soil by finger every few days and water when the top two or three centimetres are dry, before the plant slumps.
Overwatering and root rot
Peace lilies are sold as plants that love water, and many are killed by it. In soil that stays wet, the roots suffocate and rot. The plant droops because the dead roots cannot supply the leaves, and the soil is wet, so the owner waters again. Lower leaves yellow, sometimes with brown soft patches. Leaf stems darken and soften at the soil line. The pot smells sour.
What to do: do not water. Slide the plant out of the pot. Healthy peace lily roots are white to pale tan and firm; rotted ones are brown, soft, and slide off their core. Cut all soft roots back to firm tissue, remove the old soil, and repot in fresh airy mix in a pot with drainage, no larger than the roots need. Water once to settle the mix and then not again until the top of the soil is dry. Remove leaves that are more than half yellow.
Recovery: new roots in two to four weeks in warm bright conditions; new leaves after that. If the crown at the soil line has gone soft, the plant is usually past saving, but healthy side shoots with their own roots can be separated and potted.
Shock after a move or repot
A peace lily brought home from a shop, moved to a new room, or repotted often droops for several days while its roots re-establish and the leaves adjust to different humidity and light. The soil is moist but not wet and the leaves are green.
What to do: nothing except steady care in one spot with bright indirect light. It recovers within a week or two.
Cold
Peace lilies dislike anything below about 15 degrees Celsius. A night on a cold windowsill, a draft from an outside door, or an unheated room in winter makes the leaves droop and, after a hard chill, go limp and dark.
What to do: move the plant away from cold glass and drafts. A chilled plant with green leaves recovers in a few days; leaves that went dark and mushy are lost.
Heat and direct sun
In a hot window the leaves lose water faster than the roots can replace it, and the plant droops in the afternoon and recovers overnight, even with moist soil. Direct sun also bleaches and scorches the leaves.
What to do: move it out of direct sun to bright indirect light, away from radiators and heaters.
Pests
Mealybugs, scale and spider mites weaken a peace lily and leave it limp and pale. Look for white cottony specks at the leaf bases, small brown bumps on the leaf stems, fine webbing and stippling on the undersides, and a sticky film on the leaves.
What to do: wipe the plant down, treat with insecticidal soap or diluted horticultural oil, repeat weekly for a month, and isolate it from other plants.
The root check
When the pot weight and the soil do not settle it, look at the roots. Tip the pot on its side, support the crown, and slide the root ball out. White, cream or tan roots that hold together and smell of soil are healthy; brown or black roots that are soft or slimy and smell sour are rotted. Put a healthy root ball straight back and look elsewhere; trim and repot a rotted one.
What to do today, by cause
- Underwatering: soak thoroughly, rewet from below if the soil has shrunk, expect recovery in hours, then water before it wilts next time.
- Overwatering: stop watering, unpot, trim rotten roots, repot in airy mix.
- Shock: leave it in one bright spot for a week or two.
- Cold, heat or sun: move it.
- Pests: wipe, treat weekly for a month, isolate.
Frequently asked questions
How long does a drooping peace lily take to recover?
A thirsty peace lily stands back up within two to six hours of a thorough watering. One recovering from root rot takes two to four weeks to grow new roots and longer to produce new leaves. One in shock from a move recovers within a week or two.
Is it bad to let a peace lily wilt before watering?
Yes, as a habit. The plant survives it, but every collapse damages fine roots and browns leaf tips, and a peace lily that wilts weekly gets smaller, browner and flowers less over a year. Water when the top of the soil is dry, before it slumps.
Why is my peace lily still drooping after watering?
Either the water ran down the gap between shrunken soil and the pot without wetting the roots, in which case rewet from below, or the roots have rotted and cannot take up water, in which case lift the pot: if it is heavy and the soil is wet, unpot and check the roots.
Can an overwatered peace lily recover?
Yes, if firm roots remain. Trim the rotted roots, repot in fresh airy mix in a pot with drainage, and hold off watering until the soil dries. If the crown is soft, separate any healthy side shoots with their own roots and pot those.