The peace lily (Spathiphyllum spp.) is a tropical plant commonly grown as a flowering house plant. Though largely resistant to pests, peace lilies commonly produce brown leaves due to poor cultural conditions.
Location
Peace lilies are extremely sensitive to their environment and often drop leaves when moved to a new location. Grow peace lilies in bright, indirect sunlight to keep leaves from getting scorched.
Watering
Peace lilies may produce brown leaves when given too much or too little water. Water the plant deeply and evenly whenever the soil is dry to the touch, and mist a little warm water on the leaves.
Prevention
Prevent peace lily problems by following proper care requirements. Regularly wipe down the plants leaves to remove dust and grime that may inhibit the plant's ability to take in sunlight, and use a balanced houseplant fertiliser every two to three months.