Houseplant · Araceae
Peace Lily
Spathiphyllum wallisii
A forgiving, easygoing houseplant that wilts to signal its thirst and answers a little light with crisp white spathes.
Bright indirect
68–85°F · 20–29°C
USDA 11–12
1–6 ft · 0.3–1.8 m
Overview
Few houseplants ask for so little, and that ease is much of why the peace lily turns up in living rooms and offices everywhere. Its home is the humid tropical forest of Colombia and Venezuela, where it lives down on the shaded forest floor beneath the canopy. Growing in that dim understory is precisely why it shrugs off the weak light found in most rooms.
The draw is the flower. What looks like a single white blossom is actually a spathe, a smooth, hooded leaf that curls around a slim spike crowded with the true tiny flowers. Held above the deep green, lacquered leaves, those pale spathes are the entire reason to grow it, and a contented plant sends them up on and off through spring and summer.
It also wears its thirst openly. Let the soil go dry and the leaves and stems slump in a soft, full-plant collapse, only to rise again within hours once water reaches the roots. That visible signal makes it kind to a beginner, though a plant pushed to wilt over and over will drop leaves as the seasons pass.
Care
The short version: soft, indirect light with no direct sun, soil held evenly moist yet never waterlogged, warmth above 60°F (16°C), and plenty of moisture in the air. Set it out of reach of pets and children, since every part irritates on contact.
Light
Set it in bright, indirect light and shield it from direct sun, whose rays burn the leaves brown. It truly does cope with low light, but a shadowy nook yields leaves and almost no white spathes, so a brighter perch wins if blooms are the goal.
Water
Hold the soil evenly moist but never waterlogged, allowing only the top layer to dry between drinks. The plant folds into a steep slump when it dries out and stiffens back within hours of watering, yet that flop is no substitute for a routine. Pour room-temperature, dechlorinated water, and never leave the pot standing in a filled saucer.
Soil
Root it in a rich, free-draining potting mix loaded with organic matter. A slightly acidic blend suits it best, near a pH of 6.0 or just under, and sharp drainage is what keeps the roots healthy.
Temperature
Ordinary indoor warmth keeps it happy, ideally 68°F to 85°F (20°C to 29°C). Frost is no friend to it and the cold soon does harm, so hold it well above 40°F (4°C) and clear of chilly drafts and frosty winter glass.
Humidity
At its core this is a high-humidity plant, shaped by the damp tropical forest it came from. Bone-dry indoor air shows up as brown, brittle leaf tips, so cluster it among other plants, perch it on a pebble tray, or set a humidifier close by.
Feeding
It runs on very little food. Offer a balanced liquid fertilizer at roughly quarter strength through the spring and summer push, about every 6 to 8 weeks. An overfed plant browns at the leaf tips, so when you hesitate, feed less.
Pruning
There's barely a thing to manage here. Simply snip away yellowed or damaged leaves and finished flower stalks right at the base as they turn, which keeps the plant neat and pours its energy into fresh growth.
Repotting
Move it up every 1 to 2 years, or once roots begin to creep through the drainage holes, best done in late winter to early spring. It blooms more freely when held slightly potbound, so hold off on jumping to a much larger pot.
Size & spacing
Indoors it generally holds to around 1 to 3 feet, while the biggest cultivars stretch up to 6 feet (183 cm) tall and fan out close to 5 feet (152 cm) across. Leave a large one elbow room so its sweeping leaves don't press flat against a wall.
Troubleshooting
Nearly every peace lily complaint comes down to water, light, or salt, and the plant wears its trouble plainly. A sudden slump reads as thirst, scorched edges point to salt or dry air, and yellow leaves in wet soil mean the roots are failing. Find the picture that matches yours below before you reach for a fix.
Bottom foliage fading to yellow above constantly soggy soil
When the lower leaves fade to yellow and the soil sits heavy and waterlogged, the trouble underneath is root rot brought on by too much water. Hold off watering, tip out any pooled water in the saucer, and slide the plant up to inspect the roots, which go dark and slimy once rot takes hold. Move it into a fresh, fast-draining mix, snip off the dead roots, and let the top layer dry a touch before each future watering.
Fix:
- Stop overwatering and empty any saucer of standing water
- Improve drainage; repot into fresh, well-drained mix and trim away rotted roots
Every leaf sagging toward the pot, then standing firm again once watered
When every stem goes soft and the leaves fold toward the floor, that slump is thirst and nothing worse. The soil has run too dry, so the leaves lose their firmness in an instant, then stiffen back into shape a few hours after a deep soak. Some growers treat the droop as a built-in cue, but repeated wilting strips leaves away, so reach for the watering can before the plant sags.
Fix:
- Water thoroughly until water drains from the bottom
- Allow excess water to drain away and do not leave the pot sitting in water
Plenty of leaves but no white blooms
Tuck a peace lily into a shadowy corner and you get glossy green foliage with not a single white spathe to show for it. Shift it where soft, indirect light reaches the leaves and the blooms tend to return. Keep in mind that a young specimen, or one resting in its quiet season, may just need patience, since many cultivars flower mostly across spring and summer.
Fix:
- Move to a brighter spot with bright, indirect light (no direct sun)
- Be patient through the natural spring-to-summer bloom period for season-dependent cultivars
Papery brown scorch forming at the leaf tips and along the margins
Dry brown edges that crumble at the slightest touch usually signal a salt buildup, left behind by heavy feeding or by the chlorine and fluoride riding in tap water. Run plenty of clean water through the pot to rinse those salts away, then ease the feed down to roughly quarter strength and pour only room-temperature, dechlorinated water from then on. Parched air sharpens the problem, so lift the moisture in the air surrounding the leaves.
Fix:
- Leach the soil with plenty of water to flush excess salts
- Cut fertilizer back to about quarter strength and apply less often
- Water with room-temperature, dechlorinated or distilled water
- Raise humidity around the plant
Toxicity
The gentle name aside, a peace lily is not safe to chew. Insoluble calcium oxalate crystals run through every part, pricking the mouth and throat the instant they touch tissue and leaving burning, drool, and swelling behind in pets and people both. It isn't a true lily, so it spares cats the fatal kidney failure that Easter lilies cause, yet it still stings and no part is edible, so settle it well beyond the reach of animals and small children.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
One bite into a leaf loads a cat's mouth with needle-fine calcium oxalate crystals, and the sting comes on within moments. Watch for streaming drool, a paw rubbing at the muzzle, and a tongue or lips puffed up enough to make swallowing a struggle.
Dogs Toxic
A dog meets the very same crystals, which prickle the lining of the mouth and throat just as they do in cats. The tell is drool, vomiting, and a dog that turns away from its bowl right after gnawing a leaf.
Horses Toxic
Those crystals sting a horse exactly as they sting smaller animals, leaving a sore mouth, a string of drool, and no appetite for food. Set the plant far from any stable or paddock.
Rabbits Toxic
The same biting crystals run through every part of the plant, so a nibbling rabbit ends up with a burning mouth and no wish to eat. Keep the leaves out of reach entirely.
Livestock Toxic
Cattle, goats, and sheep meet the same mouth and gut sting if they reach the leaves. Pen the plant well away from anywhere grazing animals roam.
Birds Toxic
A bird that nips at the foliage gets the same scorching of mouth and throat as any other animal. Place the plant somewhere no bird can ever perch beside it.
People Caution
Not a scrap of a peace lily belongs in the mouth. A single bite sets off instant burning across the lips and mouth, with drool and swelling close behind, so shelve it well away from toddlers who taste-test everything.
Despite the name it is not a true lily (it is an aroid, Araceae) and is far less dangerous than true Lilium, but it still causes painful oral/GI irritation if chewed
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Peace lilies span a broad range of sizes, from tabletop miniatures to leafy giants that fill a floor. A handful of cultivars show up often enough to recognize by name.
'Mauna Loa' (and 'Mauna Loa Supreme')
Stocked in nearly every garden shop, this favorite holds large white spathes above a tidy plant that levels off around 2 to 3 feet tall.
'Sensation'
The giant of the group, it stretches to 5 to 6 feet and unfurls broad, bold leaves that can claim a whole corner by themselves.
'Domino'
Marbled with white streaks and flecks across its green leaves, this variegated form holds to roughly 30 inches tall.
'Petite'
A small, tight grower that stays compact enough for a desktop or a narrow windowsill.
How to propagate
Only one method reliably gives you more peace lilies, and it falls right on the day you'd repot anyway.
DivisionEasy
Late winter to early spring, typically when repotting · Several weeks to a few months
Division is the only way to multiply a peace lily, because no leaf or stem cutting will ever strike roots. The window that works best falls in late winter to early spring, the very moment you'd already have it out for repotting. Slide the plant from its pot, ease or slice the root mass into chunks that each carry their own roots and leaves, and pot each one separately. Give every fresh division anywhere from a few weeks to a few months to root in and push out new growth.
Myths
The peace lily counts as a genuine lily, making it every bit as dangerous to a cat as an Easter lily.
This plant sits in the arum family rather than the true lily clan, so it carries none of that lethal threat. The ASPCA does flag it as toxic to cats and dogs, but the damage comes from calcium oxalate crystals that scorch and inflame the mouth and gut. It does not cause the kidney failure that true lilies and daylilies bring on in cats, yet it still stings, so keep it clear of pets.
Keeping a peace lily indoors purifies the room, stripping pollutants right out of the air.
That claim grew out of a sealed-chamber experiment that has little to do with a lived-in room. When researchers pooled 196 results from 12 of those studies, they found houseplants make no meaningful dent in indoor air quality, and you'd have to crowd in somewhere between 10 and 1000 plants per square meter to rival what ordinary ventilation already handles.
Sources
- Plants of the World Online, Royal Botanic Gardens Kew
- NC State Extension Plant Toolbox
- ASPCA Animal Poison Control
- Missouri Botanical Garden Plant Finder
- Clemson Cooperative Extension HGIC
- University of Florida IFAS Extension (EDIS EP477)
- University of Florida IFAS Extension (EDIS EP320)
- Journal of Exposure Science & Environmental Epidemiology (Cummings & Waring, 2020; PubMed)