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Pruning bushes will encourage new growth and flowering and keep them hardy. Removing dead and diseased branches is vital to your bush's health. It can also deter pests from infesting your bushes. Not only is it beneficial to the bushes, trimming and shaping them will make your lawn look lush and polished.

Mature lilac bushes that are large and overgrown are more challenging to remove than small lilac bushes. Large lilac bushes have deeper roots that are more widespread, making it harder to dig them up and remove them. If you don’t dig under and around the primary roots, then you run the risk of the lilac bush growing back. So, it is a time-consuming process if done correctly. 

While you can leave roots in the ground, if you don’t want the shrub to regrow again over time, it’s best not to leave any roots behind. Ensure you remove as much of the shrub as possible, including the root ball and any main roots you can see, to prevent new growth. Some gardeners opt for using a chemical treatment to prevent the stump from growing back, but this can kill beneficial microorganisms living in your soil.

If you don’t remove a bush properly, it’ll come back each year. Removing the root system entirely is the only way to ensure the plant doesn’t have a chance to grow back. You can also use natural weed killers or you can choose to suppress the area with landscaping fabric. Additionally, consider planting alternative, non-invasive vegetation to deter the return of thorn bushes.