proletariatcsp

I overwintered my large peace lilly in the garage and the leaf tips turned black just like that. This came right after some mushrooms had grown in the same pot, so I wonder if it was a leaf mold. The black eventually spread into the whole leaf and killed the plant.

Not sure if that is actually mold, but I have heard of certain deficiencies and chlorosis causing leaf rot.

The roots of my lilly were also rotting, but than my plant was way worse than your looks. I would cut the black off the leaves or the whole leaves, and repot with new soil, inspect the roots while your at it too.

Your water may be contributing, try to fill a bucket and let it sit in the sun for 2 days, water the nanner with the sun 'warm' water afterwards. Hot water maybe not a good idea, I know my water buckets get very hot in the afternoon. I wish you the best with it!