Peace lilies (Spathiphyllum) are popular houseplants, admired for their glossy green foliage and distinctive white, flag-like spathes. These elegant plants have specific light requirements. When exposed to excessive light, peace lilies can suffer from sunburn, a common issue.
Identifying Sunburn
Sunburn on peace lilies manifests as yellowing foliage, often with brown or bleached patches. These discolored areas vary in size depending on the intensity and duration of sun exposure. In severe cases, leaf tips and edges may become crispy or brittle, and leaves might curl or droop. This damage typically appears on parts of the plant most directly exposed to the light source.
Causes of Sunburn
Peace lilies originate from the understory of tropical rainforests, accustomed to dappled, filtered sunlight rather than direct, intense rays. Sunburn occurs when plants are placed in direct sunlight, such as near a south or west-facing window, where light intensity is highest. Sudden transitions to brighter environments, like moving the plant outdoors without gradual acclimation, can also cause severe burning. Reflective surfaces, such as mirrors or light-colored walls, can amplify light intensity, making even indirect light too strong.
Treating Sunburnt Peace Lilies
Relocate a sunburnt peace lily immediately to a shadier spot, such as a north or east-facing window, or an area with filtered light. Damaged leaves will not recover their original appearance; prune them using clean, sharp scissors or pruning shears at the base of their stems to redirect energy to new growth.
After sunburn, the plant may need more water due to stress. Keep the soil consistently moist but not waterlogged to support recovery. Check the top inch of soil; if dry, water thoroughly until it drains from the pot. Avoid overwatering, which can cause root rot.
Preventing Future Sunburn
To prevent future sunburn, consistently provide your peace lily with optimal light conditions. Bright, indirect light is ideal, mimicking their natural rainforest environment. Placing the plant near a north or east-facing window is often effective, as these locations typically receive gentler light. Monitoring light conditions throughout the day and across seasons is also important, as light intensity shifts.
If your plant must be near a window that receives direct sun, use sheer curtains to diffuse the light and protect the foliage. Alternatively, position the plant a few feet away from the window to reduce light exposure. When moving your peace lily to a brighter location or outdoors, gradually acclimate it over several weeks. Start by placing it in a shadier spot, then progressively expose it to more light in small increments. This allows the plant to adjust.