Houseplant · Araceae
Peace Lily
Spathiphyllum wallisii
An easygoing, hard-to-kill houseplant that flags its own thirst and pays back a little light with crisp white blooms.
Bright indirect
68–85°F · 20–29°C
USDA 11–12
1–6 ft · 0.3–1.8 m
Overview
Few houseplants ask for less than a peace lily, and that easy temperament is why it turns up in homes and offices everywhere. Its roots trace to the steamy tropical forests of Colombia and Venezuela, where it thrives down in the deep shade of the forest floor. That ancestry is precisely what lets it shrug off the dim light most rooms serve up.
The draw, for most growers, is the flower. What looks like a single white bloom is actually a spathe, a curved leaf-like hood cupped around a slim spike that carries the real flowers. Poised against deep, glossy green leaves, those bright spathes are the whole reason to grow it, and a contented plant throws them out on and off through spring and summer.
It also keeps a handy trick up its sleeve, flagging its thirst for all to see. Let the soil run dry and the entire plant droops dramatically, then springs back upright within hours of a good soak. That makes it wonderfully forgiving for a beginner, though repeated wilting episodes will gradually thin out its leaves.
Care
The short version: aim for bright, indirect light with zero direct sun, soil held evenly moist yet never waterlogged, steady warmth above 60°F (16°C), and plenty of humidity. Park it out of reach of pets and children, since every part of it stings.
Light
Aim for bright, indirect light and keep it clear of direct sun, which sears the foliage. It truly does cope with low light, but a shadowy corner trades blooms for plain leaves, so a brighter perch wins if flowers are the goal.
Water
Hold the soil evenly moist but never soggy, letting only the top layer dry off between drinks. The plant flops hard when it runs dry and rights itself within hours of water, yet that rescue act makes a poor schedule. Reach for room-temperature, dechlorinated water and never let the pot linger in a saucer.
Soil
Set it in a rich, well-drained potting mix loaded with organic matter. It leans slightly acidic, around a pH of 6.0 or a shade lower, and sharp drainage is what keeps the roots happy and healthy.
Temperature
Ordinary room warmth suits it fine, with 68°F to 85°F (20°C to 29°C) the sweet spot. Cold bites it since it has no frost tolerance, so hold it well above 40°F (4°C) and shield it from chilly drafts and winter windows.
Humidity
Born in tropical forest, it craves a high-humidity setting. Parched indoor air announces itself as brown, crispy leaf tips, so cluster it with other plants, perch it on a pebble tray, or run a humidifier close by.
Feeding
It barely needs feeding at all. Offer a balanced liquid fertilizer at roughly quarter strength through the spring and summer growth, about every 6 to 8 weeks. Overdo the feed and the leaf tips scorch brown, so when you hesitate, feed less.
Pruning
There is next to nothing to manage here. Simply snip away yellowed or damaged leaves and spent flower stalks at the base whenever they crop up, which keeps the plant trim and channels its energy into fresh growth.
Repotting
Move it up every 1 to 2 years, or once roots start nosing through the drainage holes, ideally in late winter to early spring. It blooms more freely when held slightly potbound, so hold back from jumping to a much bigger pot.
Size & spacing
Indoors it tends to hold at 1 to 3 feet, though the biggest cultivars can rise to 6 feet (183 cm) tall and fan out close to 5 feet (152 cm) across. Hand a large one some breathing room so its arching leaves aren't pressed flat against a wall.
Troubleshooting
Nearly every peace lily hiccup comes down to water, light, or salts, and this plant practically narrates which one. A sudden flop shouts thirst, dry brown tips point to salt or humidity, and yellowing leaves in wet soil warn that the roots are failing. Pin down what you are seeing below before you make a move.
Yellowing leaves down low while the soil stays drenched
Yellowing leaves on a plant parked in waterlogged soil flag root rot, the classic price of overwatering. Hold off on watering, tip out any saucer, and dig down to inspect the roots, which go dark and slimy once rot sets in. Move it into fresh, free-draining mix, snip off every dead root, and from here on let the surface dry a touch before the next drink.
Fix:
- Stop overwatering and empty any saucer of standing water
- Improve drainage; repot into fresh, well-drained mix and trim away rotted roots
Total collapse one minute, bouncing back the next
That alarming flop is pure thirst, and nothing is broken. Every leaf sags the instant the soil runs too dry, then snaps back upright within a few hours of a deep watering. Some growers treat the droop as a built-in alarm, but a plant pushed to wilt time after time will start dropping leaves, so reach for the watering can before it gets that far.
Fix:
- Water thoroughly until water drains from the bottom
- Allow excess water to drain away and do not leave the pot sitting in water
Lush foliage, but where are the white spathes
Park a peace lily in deep shade and it pours its energy into leaves while skipping the blooms entirely. Shift it somewhere with brighter, indirect light and those spathes tend to show up soon after. A still-young plant, or one resting in its off-season, may just want patience, since plenty of cultivars flower mainly from spring into 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
Dry brown tips creeping along the leaf edges
Brittle brown tips most often signal a salt buildup, driven by heavy feeding or by the chlorine and fluoride riding along in tap water. Run plenty of water through the pot to rinse those salts away, then dial the feed back to roughly quarter strength and pour with room-temperature, dechlorinated water instead. Dry air pushes the damage further, so lift the moisture around the plant to turn the tide.
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 aside, a peace lily is not safe to chew. Every part packs insoluble calcium oxalate crystals that bite the mouth and throat on contact, sparking burning, drooling, and swelling in pets and people alike. It isn't a true lily, so it skips the fatal kidney failure that Easter lilies trigger in cats, yet it still hurts and no part is edible, so keep it well clear of animals and small children.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
One bite loads a cat's mouth with sharp calcium oxalate crystals, and the burning kicks in almost at once. Watch for heavy drooling, frantic pawing at the mouth, and a swollen tongue or lips that turn swallowing into a struggle.
Dogs Toxic
Dogs run into the very same trouble as cats, those crystals stabbing at the mouth and throat. Look for drooling, vomiting, and a dog that abruptly turns away from food after gnawing the leaves.
Horses Toxic
A horse meets the same crystal sting that hits every other animal, leaving it with a sore mouth, drooling, and no appetite. Stand the plant well away from stables and paddocks.
Rabbits Toxic
Those irritant crystals fill every part of the plant, so a nosy rabbit courts a stinging mouth and an empty belly. Block it from sampling the leaves.
Livestock Toxic
Cattle, goats, and sheep run into identical mouth and gut trouble the moment they reach the foliage. Fence it off from any patch grazing animals can wander into.
Birds Toxic
Let a pet bird gnaw the leaves and it earns the same searing mouth and throat. Keep the plant somewhere no bird could ever perch.
People Caution
Nothing on a peace lily belongs in a mouth. One bite sparks instant burning across the lips and mouth, plus drooling and swelling, so steer it clear of small children 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 huge range of sizes, from tabletop miniatures to room-filling heavyweights. A handful of cultivars show up often enough to recognize by name.
'Mauna Loa' (and 'Mauna Loa Supreme')
The big-flowered favorite stocked in nearly every garden center, it lifts large white spathes above a plant that settles in at roughly 2 to 3 feet tall.
'Sensation'
The giant of the group stretches to 5 to 6 feet and unfurls broad, bold leaves that command a whole corner by themselves.
'Domino'
Bright white streaks and splashes run across its green leaves for a variegated effect, all on a plant that holds at about 30 inches tall.
'Petite'
A pint-sized, compact pick that stays neat enough for a desk or a snug windowsill.
How to propagate
One dependable method makes more peace lilies, and it slots in perfectly with the day you repot.
DivisionEasy
Late winter to early spring, typically when repotting · Several weeks to a few months
Division is the one route to more peace lilies, because no leaf or stem cutting will ever strike roots. Aim for late winter to early spring, which conveniently lands on repotting day anyway. Slide the plant out of its pot, tease or slice the clump into pieces that each carry their own roots and leaves, and pot each one up. Every fresh division needs anywhere from a few weeks to a few months to root in and pick up growth again.
Myths
A peace lily is a true lily and just as deadly to cats as Easter lilies.
A peace lily sits in the arum clan, not among the true lilies, which spares it from carrying that same threat. The ASPCA still flags it as toxic to cats and dogs, but the trouble 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, though it certainly hurts and belongs out of any pet's reach.
Peace lilies scrub the air and strip toxins out of your home.
That claim grew out of a sealed-chamber experiment that bears little resemblance to an actual room. A peer-reviewed look at 196 results drawn from 12 of those studies concluded that potted plants make no meaningful dent in indoor air quality, and matching what an ordinary ventilation system already shifts would take somewhere from 10 to 1000 plants per square meter.
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)