I have a potted Azalea that I bring in in the winter because of the harse weather. This summer the leaves are turning red with black spots. It is also starting to bloom. What can I do? Thank you any help would be appreciated.
From the photo the plant appears extremely deficient in nutrients. This will make the plant susceptible to disease.
I recommend re-potting it into a larger container, using a nutrient rich planting soil like this one, designed for acid loving plants like azalea:
When your plant becomes established and puts out new growth, you can maintaing fertility with a flowering plant specific, slow release, organic fertilizer like this: