Doesn't bloom and leaves keep turning black. I water once a week and keep in room that is bright but not direct light. I also have given it plant food.
Lily Indoor Plant
Certified GKH Gardening Expert
Do you have a Peace Lily plant or perhaps a potted Calla Lily?
In either case, the lack of flowers and leaves turning black may indicate that you are overwatering your plant.
It is best to check the soil before watering instead of watering on a schedule.
Here are some articles that will help refresh you on the care requirements.