Houseplant · Araceae
Peace Lily
Spathiphyllum wallisii
A forgiving, beginner-friendly houseplant that flops to show it's thirsty and pays back a little light with white blooms.
Bright indirect
68–85°F · 20–29°C
USDA 11–12
1–6 ft · 0.3–1.8 m
Overview
Few houseplants are as low-effort as the peace lily, and that's a big reason it turns up in so many living rooms and offices. Its roots are in the steamy tropical forests of Colombia and Venezuela, down where it lives in the deep shade of the forest floor. That backstory explains a lot, because it's why the plant copes so well with the dim light most rooms give it.
So what's the draw? It's all about the bloom. That white flower isn't actually one flower but a spathe, a curved, leaf-like hood that wraps around a little spike carrying the real flowers. Against the deep, glossy green leaves, those crisp white hoods are really the whole point, and a content plant keeps sending them up on and off across spring and summer.
It's also got this handy trick of letting you know when it wants a drink. Once the soil goes dry the whole thing droops dramatically, then pops back upright just a few hours after you water it. That makes it easy to forgive a beginner's slips, though if you keep letting it wilt over and over you'll lose leaves down the line.
Care
The short version: give it bright, indirect light with no direct sun, keep the soil evenly moist but never soggy, stay warm above 60°F (16°C), and lean toward high humidity. And since every part is an irritant, keep it out of reach of pets and kids.
Light
Set it up with bright, indirect light and keep it clear of direct sun, which will scorch the leaves. It really has earned its name for handling low light, but tuck it in a dark corner and you'll get plenty of leaves and barely any flowers, so somewhere brighter is the way to go if blooms are what you're after.
Water
Aim to keep the soil evenly moist but never soggy, letting only the top layer dry out between drinks. It droops hard when it gets too dry and bounces right back within hours of watering, but it's not a good idea to rely on that as your reminder. Stick with room-temperature, dechlorinated water, and never leave the pot sitting in a saucer.
Soil
Pot it up in a rich, well-drained potting mix loaded with organic matter. It's happiest a touch acidic, somewhere around a pH of 6.0 or just under, and that good drainage is really what keeps the roots from running into trouble.
Temperature
Ordinary room warmth is just fine, ideally in the 68°F to 85°F (20°C to 29°C) range. It can't take frost and starts suffering once things turn cold, so keep it comfortably above 40°F (4°C) and well away from chilly drafts and winter windows.
Humidity
At heart this is a high-humidity plant, since it hails from tropical forest. When the indoor air goes dry you'll see it as brown, crispy leaf tips, so cluster it with other plants, sit it on a pebble tray, or run a humidifier close by.
Feeding
It honestly asks for very little. Reach for a balanced liquid fertilizer at about quarter strength through the spring and summer growing stretch, roughly every 6 to 8 weeks. Overdo the feeding and you'll burn the leaf tips brown, so if you're not sure, go lighter.
Pruning
There's hardly anything to fuss over here. Just cut off yellowed or damaged leaves and spent flower stalks down at the base whenever they show up, which keeps things looking neat and pushes the plant's energy toward fresh growth.
Repotting
Plan to repot every 1 to 2 years, or whenever roots begin sneaking out the drainage holes, ideally in late winter to early spring. Funny enough it blooms better when it's left slightly potbound, so don't be in a rush to bump it into a much bigger pot.
Size & spacing
Indoors it tends to hold around 1 to 3 feet, but the biggest cultivars can stretch up to 6 feet (183 cm) tall and spread close to 5 feet (152 cm) across. Give a large one some breathing room so those arching leaves aren't squashed against a wall.
Troubleshooting
Nearly every peace lily complaint comes back to water, light, or salts, and the good news is the plant is pretty clear about which one it is. A sudden flop says it's thirsty, crispy tips point to salts or dry air, and yellow leaves in soggy soil mean the roots are struggling. Figure out which one matches what you're seeing below before you do anything.
Lower leaves going yellow while the soil never seems to dry
When the lower leaves yellow on a plant that's parked in wet, heavy soil, you're usually looking at root rot brought on by too much water. Hold off on watering, tip out any saucer that's collecting runoff, and have a look at the roots, which go dark and squishy once rot sets in. Move it into fresh, well-drained mix, snip off the dead roots, and going forward let just the surface dry a little between drinks.
Fix:
- Stop overwatering and empty any saucer of standing water
- Improve drainage; repot into fresh, well-drained mix and trim away rotted roots
Suddenly limp all over, then perking right up once it's watered
Don't panic when it flops over like this, because it's almost always just thirst rather than real harm. The leaves sag the second the soil gets too dry, and a good soak usually has them standing tall again within a few hours. You can treat that as a handy little signal if you want, but keep in mind a plant you let crash repeatedly will start dropping leaves, so try to water it before it gets that desperate.
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
Stuck in deep shade, a peace lily will happily grow foliage and just never bother flowering. Shift it somewhere with brighter, indirect light and the white spathes tend to show up on their own. And if the plant is still young or simply between its natural bloom cycles, it might only need a bit more time, since lots of cultivars mostly flower from spring through summer anyway.
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
Crunchy brown patches creeping in along the leaf tips and margins
Those dry, browning tips usually come down to a salt buildup, whether from feeding too heavily or from the chlorine and fluoride sitting in your tap water. Run plenty of water through the pot to rinse those salts away, then ease the feeding back to about quarter strength and switch over to room-temperature, dechlorinated water. Dry air only adds to the trouble, so it helps to bump up the moisture in the air around the plant too.
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
That gentle name is a bit misleading, because a peace lily is not safe to chew. Every part of it carries insoluble calcium oxalate crystals that sting the mouth and throat the moment they touch, setting off burning, drooling, and swelling in pets and people the same way. It isn't a true lily, so it won't trigger the deadly kidney failure Easter lilies cause in cats, but it still hurts and no part is edible, so keep it somewhere animals and small children can't get at it.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
Take one bite and a cat ends up with a mouthful of sharp calcium oxalate crystals, and the sting comes on quick. You'll likely see a lot of drooling, paws going at the mouth, and a tongue or lips swollen enough to make swallowing tough.
Dogs Toxic
It plays out for dogs the same way it does for cats, with those crystals biting at the mouth and throat. Watch for drooling, vomiting, and a dog that abruptly turns away from food after having a chew on the leaves.
Horses Toxic
A horse gets no special pass here, since the crystals bring on the same sore mouth, drooling, and unwillingness to eat. Best to keep this plant nowhere near stables or paddocks.
Rabbits Toxic
The same stinging crystals live in every part of the plant, so a nosy rabbit is risking a burning mouth and going off its food. Just don't give it a chance to nibble the leaves.
Livestock Toxic
Cattle, goats, and sheep run into the very same mouth and gut irritation if they manage to reach the foliage. Keep it out of anywhere grazing animals can get to.
Birds Toxic
A pet bird chewing on the leaves is in for that same burning around the mouth and throat. Put the plant somewhere a bird simply can't land on it.
People Caution
There's no part of a peace lily you can safely eat. Even a small bite sets off instant burning in the mouth and lips, plus drooling and swelling, so keep it clear of little kids who put everything in their mouths.
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 show up in all sorts of sizes, from tiny desktop types to big floor plants that fill a corner. A handful of cultivars come around often enough that they're worth knowing by name.
'Mauna Loa' (and 'Mauna Loa Supreme')
This is the big-flowered favorite you'll spot in just about every shop, showing off large white spathes while topping out around 2 to 3 feet tall.
'Sensation'
If you want a real statement plant, this is the giant of the group, climbing to 5 to 6 feet with wide, bold leaves that can fill a corner all by themselves.
'Domino'
What sets this one apart is the white streaking and splashing across its green leaves, a variegated look on a plant that holds at roughly 30 inches tall.
'Petite'
True to its name, this is a small, compact pick that's right at home on a desk or a narrow windowsill.
How to propagate
There's really only one dependable way to turn one peace lily into more, and it happens to fit right in with repotting day.
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 it simply won't grow new roots from a leaf or a stem cutting. Late winter to early spring is the sweet spot, conveniently the same time you'd be repotting anyway. Just slide the plant out of its pot, then pull or cut the clump into chunks that each hold onto their own roots and leaves, and pot those up. Give each new piece anywhere from a few weeks to a few months to find its feet and start growing again.
Myths
Peace lilies are real lilies, so they're just as lethal to a cat as an Easter lily.
Here's the thing: a peace lily sits in the arum family, not the true lily family, so it just doesn't pose that same threat. Yes, the ASPCA flags it as toxic to cats and dogs, but the trouble comes from calcium oxalate crystals that burn and irritate the mouth and gut. It does not cause the kidney failure that true lilies and daylilies bring on in cats, even though it still hurts and belongs well out of any pet's reach.
A peace lily works like a natural filter, scrubbing toxins from the air in your house.
This one goes back to a sealed-chamber test that just doesn't match what happens in an actual room. When researchers pulled together 196 results from 12 of those studies, they found potted plants make no meaningful dent in indoor air quality, and you'd have to pack in somewhere between 10 and 1000 plants per square meter to keep up with what your normal 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)