In general, you can prune up to one third of the height of most shrubs without damaging them. There are a few exceptions to this rule: Pine shrubs, for example, can’t be trimmed below the point of new growth without damaging them.

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.

Yes, many pros leave clippings, as they break down quickly, enhancing your lawn’s nutrient profile without extra effort from you.

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.