Keep the soil moist, but make sure not to overwater. If the white sails of the plant are beginning to brown, it is a sign that it requires more water. The Peace Lily is sensitive to chemicals commonly found in tap water, so filtered, room-temperature water when possible.
To check the water levels of your plant’s soil, place a water meter 6-8 inches into the soil, where it will give you an accurate indication. If you do n’t own a water meter, stick one finger knuckle-deep into the soil. At this depth, you will be able to accurately account for the soil’s level of moistness.