Answer: Lilacs tend to try to colonize an area by sending up lots of suckers from the roots. You can prune those suckers off at ground level or allow them to grow. If you let them grow you will have a multi-stemmed bush instead of a single stemmed bush. Lilacs bloom in the spring and they spend the summer months developing those flower buds. Wait until after it blooms next spring and then prune it back. It will develop flower buds on the new growth, which will open next spring. If you prune every year you will have a full and thick shrub with lots of blooms. Enjoy!
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