Answer: The key is lack of adequate sunshine. Lilacs need 8 hours of sun in order to bloom well. I think you're on the right track, though. Lilacs should be pruned immediately after flowering because they spend the summer producing flower buds for the following years floral display. Pruning encourages new growth and flowers will be at the tips of the stems. Lilacs need a pronounced winter chill. If your winters have been mild for the past few years, that may account for lack of flowers. I know you recently had snow so this winter may have been cold enough for your lilac and it should produce flower buds this summer for next springs floral display. I hope you don't have a late frost that might nip the flower buds before they can open next year. Aside from full sun, adequate water, no fertilizer and a cold winter, there's not much you can do to encourage more flowers. Best wishes with your lilac!
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