Peace Lily Care: Water, Light and Why It Won't Flower

Keep a peace lily out of direct sun, keep the mix moist but never soggy, and hold the room between 68 and 85 F. NC State Extension's instruction is partial to deep shade and specifically says not to place plants in direct sun, because direct sunlight causes brown leaf tips. For water it says keep the soil moist but not soggy, allowing it to dry between waterings, and notes that watering from below works well.

NC State gives the day range as 68 to 85 F with a night drop of no more than 10 F, and warns that below 40 F the leaves, stems and roots take damage.

Clemson Extension adds the feeding figure: a balanced 20-20-20 liquid houseplant fertiliser every six to eight weeks in spring and summer at a quarter of the recommended strength.

The plant is toxic - see the pet safety page.

NC State places peace lily in partial to deep shade and rules out direct sun. Clemson phrases it usefully: it will tolerate low light conditions but grows best in bright indirect light, and direct sun scorches the foliage.

Those are compatible statements, and the difference between them is flowers. Clemson lists insufficient light as one of the two reasons a peace lily does not bloom, the other being a plant less than a year old. A peace lily parked in a dark hallway will stay alive and green for years without ever producing a spathe.

A north window, or a few feet back from an east window, is the position that gives you both healthy leaves and flowers.

Peace lily sits in the middle of the watering scale. NC State says keep the soil moist but not soggy and allow it to dry between waterings. Clemson repeats it: moist but not waterlogged, with slight drying allowed, using room temperature water and never leaving the plant standing in excess water, which causes root rot.

A peace lily wilts dramatically when it dries out and recovers after watering, which teaches people to wait for the wilt. Clemson names excessive soil drying as one cause of brown leaf tips.

Water until it runs from the drainage holes, then empty the saucer. Clemson's watering sheet recommends water between 62 and 72 F and warns against softened water because of the sodium and chloride it adds.

Clemson's numbers are specific and worth following exactly, because peace lilies are easy to over-feed: a balanced liquid houseplant fertiliser, 20-20-20, every six to eight weeks during spring and summer, at one quarter of the recommended strength. Over-fertilising causes leaf tip and root burn, and Clemson names over-fertilisation as a cause of brown tips.

For repotting, Clemson says to choose a container only one to two inches larger than the original, and to repot when roots grow through the drainage holes or circle the soil surface, during the growing season.

If you see white crusty deposits on the soil surface or pot rim, Clemson identifies that as salt build-up. Drench the pot to leach the salts out, scrape off the crust and top up with fresh mix.

Clemson gives two reasons a peace lily does not flower: the plant is less than a year old, or it is not getting enough light. Neither is fixed by fertiliser.

If the plant is mature, move it somewhere brighter but still out of direct sun, and give it a season. NC State notes peace lilies flower freely year-round with no specific bloom time, so there is no window you have missed.

What you are waiting for is the spathe, not a petal. NC State describes it as a white, sail-like structure four to twelve inches long held above the foliage, turning pale green after about ten days. Clemson calls the flowers lightly fragrant and calla-like, and notes they turn pale green with age. A greening spathe is not a problem; it is the flower ageing.

• Brown leaf tips. The signature complaint. NC State blames direct sun, underwatering or low humidity; Clemson blames over-fertilisation or excessive soil drying. Work through those four before buying anything.
• Yellow lower leaves. Clemson's disorder sheet puts general yellowing down to insufficient light, poor feeding, pests or most often overwatering; check that the pot drains and is not standing in water.
• Collapse, then recovery after watering. Underwatering. Reliable as a signal, bad as a schedule.
• Mealybugs. NC State calls them the most common indoor pest on peace lily and also lists purple mite; Clemson adds fungus gnats, spider mites and scale.
• Dust. NC State recommends cleaning the leaves regularly with a damp cloth. Clemson advises against commercial leaf shine products.

Peace lily is toxic. NC State rates the severity medium, states that the leaves are poisonous if eaten in large quantities, and names calcium oxalate crystals as the cause. The listed signs are severe mouth pain, a burning sensation on the lips, tongue and throat, excessive drooling, vomiting and difficulty swallowing, and it is listed as toxic to humans, dogs, cats, horses and children. Clemson says the same in shorter form.

If a pet has eaten some, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435; for a person, Poison Control on 1-800-222-1222. Our peace lily pet safety page has the listing.

Near a north window, or a few feet back from an east window, away from vents and draughts. Patch Plants calls an east-facing window ideal because it gives moderate light without burning the leaves. Clemson Extension says peace lilies tolerate low light but grow best in bright indirect light, that direct sun scorches the foliage, and that the plant should not sit where heating or air-conditioning vents blow on it, because hot, cold or draughty spots damage it.

Clemson also warns that temperatures below 60 F can cause cold damage, so keep it off winter windowsills.

Small steps up. Clemson says to choose a container only one to two inches larger than the current pot, and to repot when roots grow through the drainage holes, ideally in the growing season when it recovers faster. Patch Plants gives the same guidance in metric, one to two sizes or 2 to 5 cm larger, in spring. A pot much bigger than the roots stays wet for longer, and Clemson names standing water as a cause of root rot. If the plant has grown too large, divide it at repotting rather than moving it into a much bigger pot; Patch notes peace lilies can be divided then.

You can, but trimming is cosmetic; the tip will not turn green again, and the cause is still there. Clemson attributes brown leaf edges to over-fertilising or letting the soil dry out too much, and the section above adds NC State's causes: direct sun and low humidity. Fix those first.

For tidying, use clean, sharp scissors and follow the natural shape of the leaf. A leaf that has yellowed or browned all the way is no longer feeding the plant; cut it off at the base of its stalk. Spent flowers turn pale green as they age, as Clemson notes, and can be cut off at the base of the flower stalk once they fade.

It is a home remedy with no support in the sources we checked, and it can backfire. Robert Pavlis at Garden Myths summarises trials in which sugar gave no yield benefit to corn or soybeans and radishes grew better without it; strong sugar solutions dehydrate plants, and sugar in soil feeds bacteria that then compete with the plant for nitrogen. Cut flowers are the only place he finds a benefit.

A peace lily makes its own sugar by photosynthesis. What it needs is light and a light hand with fertiliser: Clemson's schedule, given above, is a balanced 20-20-20 at a quarter strength every six to eight weeks in spring and summer.

Patch Plants recommends rainwater over tap water. Clemson's watering guidance, cited above, is less strict: room-temperature water between 62 and 72 F, and never softened water, which adds sodium and chloride. If brown tips persist despite correct watering and light, switching to rain or filtered water is a reasonable test.

Patch also suggests misting every few days. Penn State Extension, cited on our pothos care page, found that misting raises humidity only until the water evaporates, which can take minutes; grouping plants or running a humidifier works better.

The sections on placement, pots, trimming and home remedies were added on 2026-09-25. Research and drafting were done with the help of AI, and every figure was checked line by line against the sources listed on this page.

Yes. Peace lily copes well with the lower light of a bedroom: ProFlowers says it manages in darker spaces including bedrooms, and Costa Farms lists bedrooms among suitable places. None of the sources we checked describes any risk from sleeping in the same room as one.

Two points to keep in mind:

• It is toxic if chewed. NC State lists calcium oxalate crystals (see the pets section above). In a bedroom shared with a cat, dog or small child, put it where they cannot reach it, not on a low nightstand.
• Do not expect cleaner air. ProFlowers repeats NASA's listing of peace lily among top household air-cleaning plants, which dates from a 1989 study. A 2019 Drexel University review of a dozen studies spanning 30 years found it would take 100 to 1,000 plants per square metre of floor space to match the air cleaning of a building's ventilation. Keep one because you like it, and open a window for fresh air.

• Toxic to pets and people if eaten. Medium severity, calcium oxalate crystals (NC State).
• Brown tips. Sensitive to direct sun, low humidity, over-fertilising and drying out (NC State, Clemson); ProFlowers adds overwatering.
• Dramatic wilting. It collapses when dry and recovers after watering (Costa Farms, ProFlowers), which tempts people to water on a fixed schedule and overdo it.
• Few flowers in low light. Costa Farms says it tolerates low light but will not bloom much there.
• Cold-sensitive. ProFlowers says it cannot take temperatures below 45 F or cold drafts.
• Pests. Mealybugs are the most common indoor pest (NC State); ProFlowers also lists spider mites and aphids, and says regular leaf wiping keeps most of them down.

It can live there for a while under electric light, though it will not flower much. ProFlowers says peace lilies tolerate fluorescent lights and can grow in rooms without windows, and places them 6 to 8 feet from a north- or west-facing window where there is one. Costa Farms notes they bloom best in high light. In a windowless office, keep the lights on through the working day, water less because the soil dries slowly, and give it a few weeks by a window now and then if it stops putting out new leaves.

Yes, it is one of the most tolerant flowering houseplants, as long as you accept that light controls the flowers. Costa Farms says it blooms best in high light and tolerates low light well but will bloom little, if at all, there. South Dakota State University Extension puts bright, indirect light first and gives a comfortable range of 65 to 80 F, with no exposure to 55 F or lower. It also tells you when it is thirsty: SDSU says drooping or wilting leaves mean it is not getting enough water, and Costa Farms notes that it recovers quickly once watered.

The one real drawback is toxicity. SDSU says all parts contain calcium oxalate and are mildly toxic, so keep it away from pets and children (see the pets section above).

Costa Farms lists peace lilies from tabletop to floor size:

• Large: 'Sensation', the biggest, up to 6 feet tall with very large leaves.
• Compact: 'Little Angel', 'Piccolino' and 'Sonia'.
• Others: 'Jetty', 'Patricia', and 'Jet Diamond', which has silvery-white variegation.

SDSU notes there are about 40 species, native to Central and South America. Care is the same for all; big plants simply need more floor space.

• Repot when roots show. SDSU says peace lilies tend to become root-bound and that roots coming through the drainage holes or circling the top of the soil mean it is time to move up a size, using a well-drained potting soil.
• Feed gently. SDSU calls peace lilies very sensitive to chemicals and feeds in spring and summer with an organic fertiliser; Costa Farms says once or twice a year at minimum, following the package. Over-feeding shows as brown tips, as covered above.
• Water that has stood overnight. SDSU uses room-temperature water left out overnight so the chlorine can evaporate.
• Pests. SDSU lists scale, mealybugs and fungus gnats.