Short answer
Yellowing leaves on a Peace Lily are typically caused by overwatering, which leads to root suffocation, or by chemical buildup from tap water. The most common fix is to allow the top two inches of soil to dry out completely before watering again and to switch to filtered or distilled water to avoid mineral toxicity.
Peace Lilies (Spathiphyllum wallisii) are expressive plants that communicate their needs clearly; while mild yellowing can be a natural aging process for older leaves, widespread yellowing often signals that the plant's environment is out of balance. Generally, this issue is manageable if addressed early, but it is important to distinguish between simple stress and the early signs of crown rot.
Peace Lilies prefer soil that stays consistently moist but never soggy. If the roots sit in standing water, they cannot intake oxygen, causing the foliage to turn yellow and eventually limp.
Check: Check the soil at the bottom of the pot; if it remains muddy or smells sour, you have a drainage issue.
Fix: Repot the plant into fresh, well-draining soil and ensure the pot has drainage holes. Allow the top two inches of soil to dry out between waterings.
Peace Lilies are sensitive to chemicals commonly found in municipal tap water, such as chlorine, chloramine, and excess fluoride. Over time, these minerals accumulate in the soil, causing yellowing and brown leaf tips.
Check: Look for a white crusty residue on the soil surface or the rim of the pot.
Fix: Switch to distilled, filtered, or rainwater, and flush the soil with clean water to help leach out mineral deposits.
This specific fungal pathogen thrives in warm, damp, and poorly ventilated environments. It destroys the root system, causing rapid yellowing of lower leaves and a general decline in the plant's health.
Check: Gently pull the plant from its pot and inspect the roots; infected roots will appear black, mushy, or slimy rather than firm and white.
Fix: Isolate the plant, remove all affected roots, and repot in sterile, fresh soil. In severe cases, the entire plant must be discarded to prevent the fungus from spreading.
When to worry
If the yellowing is accompanied by a foul smell from the soil, brown mushy stems, or the rapid wilting of the entire plant despite moist soil, you are likely dealing with root rot and must act immediately.
Not sure which cause it is?
Upload a photo of your Peace Lily and get a diagnosis in seconds.
Diagnose my Peace LilyYes, once a leaf has turned entirely yellow, it will not turn green again. Pruning it at the base with clean shears allows the plant to redirect its energy toward new, healthy growth.
Unlikely. Peace Lilies prefer low to medium indirect light. Too much direct sun typically causes leaf scorching (bleached or brown spots) rather than overall yellowing.
Underwatering causes the entire plant to droop dramatically, but the leaves usually remain green. Overwatering is characterized by yellowing, mushy tissue, and a potential lack of recovery even after watering.
Consistent with guidance from: University of Florida IFAS Extension, American Society for Horticultural Science.