We can’t be absolutely certain but many “problems” stem from poor soil (assuming other matters are the same, e.g. sunlight). Per above, make sure you
Provide well-drained, humus-rich soil that is slightly acidic (pH 4.5–6).
Mulch well. Shallow-rooted, azaleas tend to dry out quickly if not mulched. A mulch of oak leaf mold, pine needles, or aged oak, pine, or hemlock sawdust will keep soil acidic and moist. Read more in our Mulching Guide.
Fertilizer isn’t needed. The decaying mulch will provide all of the nutrients that azaleas need.
We can’t be absolutely certain but many “problems” stem from poor soil (assuming other matters are the same, e.g. sunlight). Per above, make sure you
Hope this helps!