Answer: As the flowers age on your peace lily they will begin to turn brown. This indicates they should be cut off the plant. The topmost flowers will turn brown first and you can safely remove them to make your plant more attractive. Flowers last about 3 weeks and there's not much you can do to keep them from aging. It might help to increase the humidity around your plant to keep the flowers from drying out too soon.
Best wishes with your flowers!
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