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Peace Lily Leaves Turning Black

Popular as a potted plant in dimly lit areas of the office or house, peace lily (Spathiphyllum spp.) grows best in warm, humid locations with an evenly moist soil. Drafts, frost and improper watering leads to sickly or dead foliage.

Causes

Black leaves on a peace lily most likely result from overwatering. This causes roots to suffocate and rot. A container resting in water in a saucer basin leads to rotting roots, which quickly manifests as sagging, black leaves and stems.

Common Errors

People not blessed with a green fingers usually assume wilting, yellow or black leaves only means the plant is "thirsty." They water the peace lily again, exacerbating the problem.

Considerations

Water the peace lily once the top 1-inch depth of soil feels dry to the touch. Then, use room-temperature water, not cold water. Empty out water from the bottom saucers within 15 minutes to keep the roots from lacking oxygen and starting to rot.

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About the Author

Jacob J. Wright became a full-time writer in 2008, with articles appearing on various websites. He has worked professionally at gardens in Colorado, Florida, Minnesota, New York, North Carolina and Pennsylvania. Wright holds a graduate diploma in environmental horticulture from the University of Melbourne, Australia, and a Master of Science in public horticulture from the University of Delaware.