From the pictures, the pot looks kind of large for that plant. But, I may be just seeing it wrong.

I think it could possibly be the fertilizer too. Others will probably be more helpful.

I agree with tisha: it does seem like kind of a big pot, considering that there are only about four individual plants in there. My instinct, which has been wrong before and which may be wrong now, would be to take it out of the pot, pull the pieces apart, shake off whatever soil and dead roots will shake off, and then repot the pieces together in the smallest pot that will hold them. (My guess from the picture is that it's in an 8" or 10" pot now; you should be able to fit the pieces that are still alive into a 5" or 6".)

The leaves slowly dying a little bit at a time sounds to me like it's too wet, and I don't really see four plants going through that much water that quickly. It's not that you're watering too much -- drenching is good -- but I think you're probably watering too often. Which can be fixed. The light is probably fine. Fertilizer can cause dead tips and leaves, but if you're reading the directions and giving that amount or less when you feed, and letting water run through the pot when you water, that's probably not the problem. I doubt humidity is the issue either, though it can also cause dead tips.

Let the plant tell you when it needs water. In a pot that size, the top couple inches can be dry while the bottom four are still wet, so you can't go by a schedule at all. Spathiphyllums that have gone too dry will collapse flat: that's too late. The right time to water is when the leaves go a little bit limp and floppy, where you can brush them with a hand and not feel much resistance. This is usually a few days before they go flat. In a large pot, it could be a long time between spells like this, depending on the time of year, amount of light, etc.

I agree it does sound like the soil is staying too wet and it's over-potted. Also, I wouldn't fill the pot all the way to the rim with soil as it shows in the photo's. You should leave about an inch or two of room so it can be watered correctly without spilling over the sides.

Billy Rae

I can only tell you what's happened with my peace lily. It was huge and beautiful for many years. I watered it every week without checking whether it needed any. Then I got "smarter" about my plants and started sticking my fingers in everything and consequently was watering peace lily less. It lost leaves and got more and more pitiful. I divided and repotted. One of the halves died and the other kept getting smaller and smaller and having brown tips on the leaves. I moved it to the guest bath for more humidity but nothing changed. Finally I figured I had nothing to lose by watering it every week like I did when I didn't know what I was doing. That did the trick. It's still small but is healthy again. You can see on the lower leaves where I had to cut away brown, but the new leaves are healthy and it's blooming for the first time in years.

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Your mileage may vary, of course, but my lily obviously likes to stay watered.

Mindy

Mine has been living bare-rooted in water for 4 yrs, and just finished flowering. All I do is thin and trim the roots every few months and keep it out of strong light.

Thank you all so much for your advice concerning my peace lily. I took her to the local plant shop and they agreed with your advice. We downpotted her to a 6-inch pot and I am watering less frequently. She is growing another new leaf (but anotehr one died :) so I am very hopeful she is on the road to recovery. Wish me luck!