I love houseplants, but I don't have a natural knack for promoting their optimal health. I am not sure what I am doing wrong with my peace lily so I will try to describe what I normally do for it, I imagine I am probably making multiple errors.
I have had it for a couple months and all of the large and small flowers have turned brown (so I trimmed them off at the base), I don't see any new flower growth, and the leave tips have also turned brown. I have not re-potted it since I bought it, but I have a bag of peat moss and a houseplant soil mix I planned on mixing together to use to re-pot it soon.
I initially had it under a North West facing window off of a covered deck area, but moved it to a brighter South East facing window, which seemed to stimulate more growth. I water it about once a week when the soil is very dry to the touch using tap water ( about 3/4 of a 17fl oz bottle) and have used a couple pumps of 1-1-1 indoor plant food per month. I have tried to keep water in the bottom of the outer pot to promote humidity, as suggested in an article I read somewhere. It stays somewhere between 70-80 degrees inside. But, it all seems to be to no avail, from what I can tell.