Peace lily

Migration

Sections

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  Kew accepts Spathiphyllum wallisii in the arum family

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  • Royal Botanic Gardens, Kew currently accepts Spathiphyllum wallisii Regel in Araceae. GardenSpecies uses that species record as the taxonomic anchor. The common name “peace lily,” however, is used horticulturally for multiple Spathiphyllum species, hybrids, and cultivars, so a store label that says only “peace lily” is not automatically proof that the plant is S. wallisii .

  • This distinction matters because many care references are written for the genus as a houseplant group. Where this page uses NC State’s Peace Lily guidance, it labels that information as genus-level horticultural context instead of silently converting it into a species-specific measurement.

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  The species-level Kew baseline is Colombia to Venezuela

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  • Kew records Spathiphyllum wallisii as native from Colombia to Venezuela and as a perennial of the wet tropical biome. That precise species range is narrower than the much broader native range of the genus Spathiphyllum , which spans parts of tropical America as well as Malesia and the western Pacific.

  • Kew also records introduced occurrences outside the native range. “Introduced” is a distribution status, not an automatic synonym for invasive or legally restricted. GardenSpecies therefore does not publish a universal invasive warning for this species; outdoor planting decisions should follow the relevant local authority where the climate permits landscape use.

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  Genus-level size figures are context, not a guaranteed species maximum

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  • NC State describes peace lilies as perennial herbs typically grown as houseplants and notes that the broader group often reaches about three feet high and wide indoors, while some cultivars can be smaller or substantially larger. That is useful shopping and placement context, but it should not be presented as one exact mature size for every S. wallisii selection.

  • Container volume, cultivar, light, temperature, root density, and division history all influence indoor scale. A compact plant sold in bloom can later expand into a wider clump as new crowns develop, so placement should allow room for leaf spread as well as pot diameter.

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  Shade tolerance does not mean a windowless corner is the goal

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  • NC State’s genus-level peace-lily guidance prefers partial to deep shade and specifically advises against direct sun. The practical indoor interpretation is bright or moderate filtered light without harsh direct exposure. A plant may survive in comparatively dim conditions, but survival is not the same as strong growth or dependable flowering.

  • If a peace lily has been in low light, do not move it abruptly into intense sun. Increase exposure gradually and watch leaf response. Brown or scorched areas can also have causes other than light, so diagnose watering, salt buildup, drafts, humidity, and pests rather than assuming every brown tip is sun injury.

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  Manage the root zone; do not follow a fixed weekday schedule

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  • NC State recommends keeping the soil moist but not soggy and allowing it to dry between waterings. Those phrases describe a moisture pattern, not a promise that every peace lily should be watered after the same number of days. Pot size, substrate, root density, room temperature, airflow, light, and season can change dry-down dramatically.

  • A useful routine is to inspect the medium and plant before watering, then water thoroughly enough to moisten the root zone while allowing excess water to drain. Repeated saturation can create root problems; repeated severe drying can also stress the plant. A decorative outer pot should not conceal standing water around the nursery pot.

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  Organic matter helps, but air and drainage still matter

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  • NC State recommends a potting mix high in organic matter and a container system that does not stay waterlogged. The important transferable principle is a medium that can hold useful moisture while still allowing oxygen around the roots. “Moisture-retentive” should not become “permanently saturated.”

  • Repot because roots, stability, or substrate condition justify it—not simply because a much larger decorative pot is available. Oversizing can leave a small root system surrounded by wet medium for too long. After repotting, reassess dry-down rather than assuming the old watering rhythm still applies.

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  Warm, draft-free conditions fit the genus-level houseplant model

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  • NC State describes warm daytime conditions around 68–85°F for peace lilies and warns that cold, drafty conditions slow growth, with extended low temperatures capable of damaging foliage and roots. Treat those figures as genus-level indoor guidance, not as a species-specific hardiness guarantee or an outdoor freeze-tolerance claim.

  • Placement near exterior doors, cold windows, or heating/cooling vents can create sharper local swings than the room thermostat suggests. If growth slows or leaves decline after a seasonal move, inspect temperature and draft exposure alongside light and watering.

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  Division follows the plant’s clumping habit

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  • For ordinary houseplant propagation, NC State lists division. Mature clumps can be separated so each division retains viable roots and growing points. Division is different from promising that a detached leaf will become a new peace lily; GardenSpecies does not invent a leaf-propagation method or a fixed rooting timetable for this species.

  • After division, avoid the temptation to keep a disturbed root system permanently wet. Use an appropriate airy medium, stable warmth, and conservative observation while the divisions re-establish.

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  The white “flower” is a spathe around a spadix

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  • Peace lilies are grown for the familiar pale spathe surrounding a central spadix. NC State notes that the spathe can age from white toward green and that plants can flower freely under suitable conditions. The exact flowering schedule, number of inflorescences, and mature size vary with cultivar and growing conditions.

  • Low light, stress, recent division, and general plant vigor can all influence flowering. A foliage-healthy plant that is not constantly blooming is not automatically unhealthy. GardenSpecies avoids guaranteed rebloom calendars and fertilizer recipes that promise flowers on command.

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  Brown tips and droop are clues, not diagnoses

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  • NC State notes mealybugs as a common indoor pest and identifies direct sun, underwatering, low humidity, and fertilizer-salt buildup among causes of leaf-tip problems. Because several stresses can look similar, inspect the environment before applying a treatment.

  • Look at the root-zone moisture, drainage, recent fertilizing, light exposure, draft history, and leaf undersides. Treat confirmed pests with regionally appropriate extension guidance rather than applying routine pesticide treatments to a plant whose problem may actually be cultural.

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  Peace lilies contain irritating calcium-oxalate crystals

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  • ASPCA lists peace lily / Spathiphyllum as toxic to dogs and cats because of insoluble calcium oxalates. Chewing can cause oral irritation, drooling, vomiting, and difficulty swallowing. Keep the plant where pets or children likely to chew foliage cannot reach it, and use veterinary, medical, or poison-control professionals for concerning exposure rather than relying on a plant-care page.

  • The common name creates another important safety distinction: peace lilies are not true lilies in Lilium or Hemerocallis . ASPCA explains that peace lilies do not cause the same acute kidney-failure syndrome associated with true-lily ingestion in cats. That does not make peace lilies pet-safe; it means the toxic mechanism and expected risk pattern are different.

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  Do not turn a cultivar trait into a species trait

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  • The horticultural peace-lily market includes dwarf and large selections as well as hybrids whose exact parentage may not be visible on a retail label. Size, leaf shape, flower size, and growth speed can therefore differ substantially between plants sold under the same common name.

  • When a cultivar name is known, keep it attached to observations and image provenance. A photograph or care note from one named cultivar should not silently become universal evidence for S. wallisii .

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  Taxonomy, horticulture, and toxicity checked 24 August 2026

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  • Kew Plants of the World Online supplies the accepted species name, family, species-level Colombia-to-Venezuela native range, and wet-tropical biome context. NC State Extension supplies the broader Spathiphyllum houseplant guidance on shade, warmth, moisture management, organic potting mix, division, flowering form, mealybugs, and common cultural problems. ASPCA supplies the dog/cat calcium-oxalate toxicity context and the distinction from true-lily kidney toxicity.

  • Image provenance: Kew's species image page shows mixed source/licence conditions, including some individual-image copyright notices. No primary image is published until GardenSpecies has a complete exact-file provenance packet.