Alexander Pensky wrote:

* Fertilizing. Nitrogen promotes leaf and branch growth and discourages
flower bud production. It can also force late season growth that gets
killed or stunted by frost damage. Phosphorus promotes flower bud
production and hardiness. Potassium is necessary for well being.

Nutrient imbalance is a possibility.

Azaleas need sun to set flower buds. If your plant has too much shade,
then that could be the problem.

For nutrients, if the foliage is a nice green, I would just fertilize
with holly-tone now. A shot of superphosphate (about a tablespoon) may
help also.

If the foilage has some yellowing, then you need to go through the
process of finding the cause. It could be too acid, not acid enough, to
much clay, no boron, too much boron, etc.

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