Why is the new unopened flower on my Anthurium turning brown instead of red> Also, the yellow stalk in the center of the flower has a brown tip and some of the leaves have small black edges. My plant is in a small pot indoors, purchased it just before Christmas. Should I repot it into a larger pot?
Your plant may have been overwatered. A potted Anthurium are susceptible to root rot.
Make sure the top inch or so of soil is dry before watering again.
Make sure the pot is draining of any excess water.
Here is a link to refresh you on the care requirements.