Answer: Lilac plants tend to sucker from the roots. It is the plants way of colonizing an area. Instead of having a single stemmed lilac you can potentially have a row or hedge of them. If you'd rather have just a single trunked plant you can cut the suckers down to soil level. Or, you can just let them grow. Lilacs develop flowers on new growth so the more stems you have, the more branching and new growth you will have. The choice is yours!
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