The Q&A Archives: Black Edges On Leaves

Question: I have a peace lily that was doing great. Now all the edges of the leaves are turning black and it spreads to the entire leaf. Do you have any suggestions as to what I may be doing wrong. I have it out of direct sunlight, and try not to overwater it. I was using plant food up until about September. I would appreciate some help.

Answer: Based on your description I am not sure what is wrong with your Peace Lily (Spathiphyllum wallisii) but I suspect it may be cold, or it may be a fungal problem indicating that temperatures are a bit too cool and that air circulation needs to be increased. The cooler (and darker) a plant is kept and the slower it grows the less water it needs, so it is also possible that you are over-watering it. This plant needs a minimum temperature of 65 degrees and does best even warmer than that. You might also try gradually increasing the amount of light it receives to compensate for the weaker winter sunshine; although this plant tolerates lower light, it actually prefers a fairly bright location with indirect light. With regard to watering, keep the soil slightly moist but not sopping wet -- check it with your finger to see if it needs water and then water with tepid rather than cold water. I hope this helps.

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