Answer: If all plants are enjoying the same health the only reasons for non-blooming are flower bud damage from late frost or pruning at the wrong time. Azaleas develop flower buds during the summer months and they just sit quietly and wait until warm spring weather. Because they are exposed, sometimes winter weather will kill them off. And, sometimes we accidentally prune them off. The only other possibility is that your non-flowering azaleas might need a dose of fertilizer. Use a 5-10-10 or 10-20-20 to encourage flower production.
Good luck with your azaleas.
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