Peace lily · Autumn
Why is my peace lily getting brown leaf tips?
Almost always dry air — and in a British autumn that usually means the heating has come on. A peace lily wants humidity; a radiator under a windowsill strips it out of the room faster than the plant can replace it. The tips go first because they are the furthest point from the roots and the last to be supplied.
- Most likely
- Dry air — the heating has come on
- Also possible
- Minerals in hard tap water
- Urgency
- None. Neither means you have killed it
Dry air comes first because the timing gives it away: in most British homes the tips start going within a few weeks of the heating season, and a peace lily is one of the plants that shows it soonest.
The second most likely cause is minerals in tap water building up in the compost. If you are in a hard-water area — most of the south and east of England — that alone will brown the tips over a few months, heating or no heating.
You can usually settle it without guessing.
Probably dry air if
- the browning started within a few weeks of the heating going on
- the plant sits above, beside, or across from a radiator
- other humidity-loving plants in the same room have gone the same way
- the brown is a thin, even rim right at the tip and edge
Probably tap water if
- the browning has crept up slowly over months, through summer as well
- there is a whitish crust on the compost surface or around the pot rim
- you live in a hard-water area
- the brown patches are broader and more irregular than a neat rim
Probably neither — and worth looking harder — if
- the leaf is yellowing before it browns, and the browning starts low down. That is more likely watering, and a peace lily will tell you it is thirsty by drooping dramatically first.
- the whole plant has collapsed. That is thirst, and it recovers within hours of a proper watering — dramatically enough that people photograph it.
- the brown is soft or mushy rather than dry and papery. That is not this problem.
- For dry air
- Move it off the radiator shelf. Group it with other plants so they share the moisture they transpire. A pebble tray under the pot helps; misting does very little, because the effect lasts minutes. A bathroom with a window is the single best room in most British houses for a peace lily in winter.
- For tap water
- Water with rainwater or filtered water where you can, and flush the pot through with a large volume of water every couple of months to carry the accumulated salts out of the bottom. Repotting into fresh compost resets it completely.
- For the tips already brown
- They will not turn green again. You can trim them with clean scissors, following the natural leaf shape rather than cutting straight across — a squared-off tip reads as damage from across the room, a shaped one does not.
- Do not increase watering to fix brown tips. Dry air is not dry soil, and a peace lily that is already drooping-then-recovering on schedule is being watered correctly.
- Do not move it somewhere brighter to compensate. It is a medium-light plant; scorch is a different and worse problem.
- Do not cut off whole leaves unless most of the leaf has gone. The plant is still drawing energy from the green part.
Peace Lily at a glance
| Botanical name | Spathiphyllum wallisii |
|---|---|
| Light | Medium |
| Water | Every 5–7 days |
| Humidity | High |
| Comfortable range | 18–27 °C |
Tells you when it's thirsty by drooping dramatically, then recovers within hours of watering. Likes humidity.
Common problems: Dramatic drooping — thirsty, but recovers quickly once watered · Brown leaf tips — dry air, or minerals in tap water · No flowers — too little light
Toxic to cats and dogs
Severity: irritant
If eaten: Oral irritation, intense burning and irritation of mouth, tongue and lips, excessive drooling, vomiting, difficulty swallowing.
Source: ASPCA, unedited.
Pet-safety information is a general guide from the ASPCA's toxic-plant database and covers cats and dogs only. "If eaten" summarises the symptoms ASPCA lists for that plant; how an animal actually reacts depends on how much it ate and on the animal. It isn't exhaustive, isn't veterinary advice, and individual animals vary — never rely on it as the sole basis for a decision about your pet. If you think your pet has eaten a harmful plant, contact a vet immediately.
Brown tips are one of the few houseplant problems with a short list of causes. Most are not. Sabz reads the care you have actually logged — how often you have watered, how long the gaps were, what you have already tried — and works out the likely cause from your plant's own history rather than from a photograph alone.
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