Answer: What the nursery person should have told you is that lilacs develop flower buds in the summer for the next year's bloom. When you pruned, you cut off all of the buds. Last summer it should have developed buds for this year's bloom, and it may have, but lilacs need a pronounced winter chill to trigger lots of blooms. If your winter was mild, the buds just didn't get the message that it was time to bloom. I'll bet that it will bloom magnificently next spring, so just be a little more patient!
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