At a glance
- Most common cause: Overwatering; soil that stays wet leads to root rot and yellowing
- Check first: Soil moisture; wet soil + yellow leaves = overwatering
- Natural aging: One or two outer leaves yellowing slowly is normal senescence
- Low light: Pale, washed-out yellowing on all leaves, not dramatic yellowing of individual leaves
- Nutrient deficiency: Yellowing between green veins (interveinal chlorosis) after long periods without fertilizer
- Yellow leaves: Will not turn green again; remove at the base and fix the cause
Why peace lily yellows differently than other plants
Peace lily (Spathiphyllum) is one of the few houseplants that clearly signals thirst with visible wilting before permanent damage occurs. Its leaves droop dramatically when dry, then recover within hours of watering. This makes underwatering easy to catch. Overwatering, which does not produce an obvious warning signal until roots are already damaged, is the harder and more common problem. When peace lily leaves yellow, the first thing to check is always the soil.
Cause 1: Overwatering and root rot (most common)
Signs: Leaves yellowing, particularly lower or outer leaves. The soil feels damp or wet when you press your finger an inch into it. The pot feels heavy. The yellowing may come with a slight musty smell from the soil. Leaf bases may feel soft.
Why it happens: Peace lily roots need oxygen. Consistently wet soil suffocates roots and creates conditions for root rot fungi. Rotting roots cannot deliver water or nutrients, and leaves begin to yellow as a result. Peace lily is particularly susceptible because it is often kept in low light where soil dries very slowly.
What to do: Stop watering immediately. If the soil has been wet for more than a week or two, remove the plant from its pot and check the roots. Healthy roots are white or tan and firm. Rotted roots are brown or black and mushy. Trim rotted roots with clean scissors and repot in fresh, well-draining mix. Do not water for 1 to 2 weeks after repotting. Going forward, water only when the top inch of soil is dry.
Cause 2: Natural aging
Signs: A single outer leaf gradually yellows over several weeks. The rest of the plant is healthy and producing new growth. The rate of yellowing is slow, one or two leaves every month or two.
Why it happens: Peace lily leaves age and senesce naturally. Outer leaves that were produced months ago eventually exhaust their productive life and yellow. This is not a disease or care problem; it is a normal part of the plant's lifecycle.
What to do: Remove yellowed leaves at the petiole base and continue normal care. Monitor the rate: if more than one or two leaves yellow per month, or if yellowing is spreading to previously healthy leaves, the cause is something else.
Cause 3: Low light
Signs: All leaves are pale and washed-out, more lime-green or yellow-green than deep green. The plant is not producing new growth or flowers. The pot is in a very dim location, away from windows. The yellowing is gradual and affects all leaves rather than individual ones.
Why it happens: Peace lily can survive in low light but cannot photosynthesize efficiently in very dim conditions. Chlorophyll production declines and leaves lose their deep green color. The plant also grows slowly and rarely blooms in very low light.
What to do: Move to a location with bright indirect light, such as a few feet from a north or east window, or within the indirect light zone of a south or west window. Avoid direct sun on the leaves, which causes bleaching and browning. Light improvement shows within a few weeks as new leaves emerge in deeper green.
Cause 4: Nutrient deficiency
Signs: Yellowing that appears between the leaf veins while the veins themselves stay green (interveinal chlorosis). This pattern is distinctive and different from the uniform yellowing of overwatering or aging. More likely in a plant that has been in the same soil for several years without fertilizing.
Why it happens: Potting soil nutrients, particularly iron and magnesium, deplete over time. Without replenishment, peace lily cannot produce sufficient chlorophyll, causing the characteristic interveinal yellowing pattern.
What to do: Fertilize with a balanced liquid houseplant fertilizer at half strength during the growing season (spring through summer), once a month. If the plant has been in the same soil for 2 or more years, repotting in fresh potting mix is the most reliable fix. Do not over-fertilize; excess fertilizer salts cause brown leaf tips and root burn.
Cause 5: Cold drafts or temperature stress
Signs: Yellowing or dark, limp patches appearing after a cold event: a window left open in winter, a cold air conditioning vent blowing directly on the plant, or temperatures below 55°F. Damage may be rapid and affect multiple leaves at once.
Why it happens: Peace lily is a tropical plant that cannot tolerate cold temperatures or cold drafts. Chilling damage causes cell breakdown that produces yellowing and soft tissue similar to overwatering damage, but the soil will not be wet.
What to do: Move the plant away from cold air sources to a location with consistent temperatures between 65 and 85°F. Remove damaged leaves. Avoid placing peace lily near exterior doors or windows that open in winter.