PlantRx

Peace lily yellow leaves

By Karim DiabatePublished How these guides are built

Peace lilies are expressive plants: they wilt dramatically when thirsty and recover within hours. That makes yellowing easier to diagnose than on most houseplants, because you can usually rule watering in or out by watching what the plant does next.

A healthy Peace Lily, photographed for reference
A healthy peace lily for comparison. This is a reference photo, not a picture of the problem. Photo by W.carter (CC BY-SA 4.0), via Wikimedia Commons.

First: this is often normal

The occasional oldest, outermost leaf going yellow while the centre keeps producing new growth is normal. Peace lilies constantly replace their outer leaves.

What it could be, and how to tell

These look alike in a photograph, so each one below lists what you would ALSO see if that is the cause. Work down the list and stop at the one where the other symptoms match too.

most common

1. Overwatering or poor drainage

What else you would see

  • soil wet more than a few days after watering
  • several leaves yellow, starting at the outside
  • leaves limp and yellow at the same time rather than crisp
  • a sour smell from the soil
How to confirm it: Slide the plant out of its pot and look at the roots. Firm and pale, silvery or white means healthy. Brown, soft, or hollow when you press them means rot.

What to do

  1. Let the top two inches dry before watering again.
  2. Empty the saucer and check the pot drains freely. A peace lily left standing in water will rot.
  3. If roots are brown and soft, trim them back to firm tissue with a sterilised blade and repot in fresh mix.
common

2. Repeated severe wilting from underwatering

What else you would see

  • a history of the whole plant collapsing before you water
  • yellowing on the leaves that collapsed hardest
  • dry soil shrunk from the pot wall
How to confirm it: A peace lily that wilts flat and revives after watering is telling you it went too far. Each collapse costs it some leaves, which yellow a few days later.

What to do

  1. Water when the top inch is dry rather than waiting for the plant to fall over.
  2. The dramatic wilt is a useful signal but a bad schedule. Do not use it as your reminder.
common

3. Too much direct light

What else you would see

  • yellowing with pale bleached or brown scorched patches
  • worst on the leaves closest to the window
  • leaves that feel hot in the afternoon
How to confirm it: Patchy, one-sided bleaching. Peace lilies are forest floor plants and burn easily.

What to do

  1. Move out of direct sun into bright indirect light, or filter the light with a curtain.
  2. Scorched tissue will not recover. Judge by new leaves.
common

4. Old age

What else you would see

  • one or two outer leaves at a time, the oldest ones
  • healthy new growth from the centre
  • no other symptoms anywhere
How to confirm it: Outermost leaves only, with the crown still pushing new growth.

What to do

  1. Cut the spent leaf off at the base with a clean blade.
  2. Nothing else is needed. This is the plant working normally.
less common

5. Nutrient shortage or exhausted soil

What else you would see

  • even pale yellow-green across most of the plant
  • smaller new leaves and few or no flowers
  • two or more years in the same soil
How to confirm it: Uniform pallor with weak new growth on long-unrepotted soil.

What to do

  1. Repot into fresh mix in spring.
  2. Feed during the growing season, following the label on the product you buy.

Common questions

Is a peace lily poisonous to cats and dogs?

Peace lilies contain calcium oxalate crystals and are widely listed as harmful to pets if chewed. We do not tell you any plant is safe. If your cat, dog or child may have chewed any part of a plant, contact a vet, or Poison Control on 1-800-222-1222 in the US, immediately rather than waiting to see what happens.

Why does my peace lily have yellow leaves and brown tips at the same time?

Those usually have different causes running together: yellowing from watering or light, brown tips from tap water minerals or dry air. Treat them as two separate problems.

Should I cut yellow leaves off a peace lily?

Yes, once they are mostly yellow. Cut the stalk right down at the base rather than trimming the leaf, which leaves an ugly stub that dies back anyway.

Before you act on any of this

This is general plant care guidance for a plant, not advice about people or animals. We never tell you whether a plant is safe to eat or touch, and we never tell you a plant is safe for a child or a pet. If a child or animal may have eaten any part of a plant, contact Poison Control (US 1-800-222-1222) or a vet immediately rather than reading further.

Treatment advice here is deliberately category level. We do not give product names, mixing ratios or application intervals. Whatever the label on the product in your hand says is the instruction that counts, and following it is your responsibility.

Where this comes from

The general horticultural facts behind this differential come from published university extension and Royal Horticultural Society guidance. What is specific to this plant, and the order the causes are ranked in, is ours, and the methodology page says where that reasoning stops being reliable.

Other peace lily problems

Related problems

Peace lily droopingPeace lily brown tipsPothos leaves turning yellow

Not sure which one it is?

PlantRx is an iPhone app that reads the photo and gives you the same kind of ranked differential you just read, for your plant specifically, with the evidence it based each answer on. The first diagnosis is free, in full. There is no subscription and no account.

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