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It’s possible to over-mulch leaves. If the leaf mulch is thick enough that it’s blocking and smothering the grass, that’s a problem. Ideally, you should still be able to see the grass when you’re done mulching to ensure its ability to continue growing. The solution is to make another pass at the top layer of leaf mulch to collect some of the top layer.

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.

Many privet varieties are considered invasive, particularly in North America. They can grow quickly, spread into the wild, and push out native species if left uncontrolled. It’s a particular problem for warmer southern states, and some regions even have warnings or regulations against planting certain types of privet. You can reduce (but not eliminate) the chances of privet spreading by cutting its flowers in summer before they develop.

Typically, the best type to trim bushes is when they’re dormant. Winter and late fall, potentially even early spring are the best times to trim your bushes. These seasons allow you better access to the branches, as all leaves are gone and the branches are more brittle, making the trimming process easier.