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What Causes Black Leaves On A Peace Lily?
Ask The Expert: I have a Peace Lily and I am noticing that some of the leaves (at the tips) are turning black. What is causing that?Â I have been cutting off the black parts, is that OK?
Thank you for your time.Â bfh
Plant Expert Reply:
There are 3 things that can cause peace lilies to turn black.
The first is a water issue - too much or too little.Â With water the leaves turn brown first then black.
The second is exposure to an extreme temperature change.Â Exposure to extreme cold will turn the peace lily leaves black.Â Exposure to extreme heat or sunlight usually causes a yellow/brownish discoloration before it becomes black.
The third is a fungus called Phytophthora (aerial blight).Â With thisÂ fungus you need to keep water off the foliage - that is how the fungus spreads.Â You may need to treat both the soil and the foliage with a fungicide.Â Check with your local nursery & garden center for the appropriate fungcide.