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Sometimes excessive nitrogen and not enough phosphorus can keep lilacs from blooming. If your lilacs are in the lawn and are being fertilized with your high nitrogen lawn fertilizer, this could be the problem. They will grow beautiful foliage at the expense of the flowers. Fertilize them with Espoma Plant-tone and Rock Phosphate according tot he label directions. The Rock Phosphate will help with flower production. Keep high nitrogen lawn fertilizer away from the shrubs.
Improper pruning (bad timing) can also reduce or inhibit blooming. Lilacs set their flower buds in late summer so they should be pruned right after they finish blooming. Do not prune them after July to be safe.
Your lilacs may still be too young to bloom. If the above suggestions are not relevant, perhaps you just need to be more patient. I would still fertilize them with Plant-tone and Rock Phosphate.