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While mulching offers many benefits, there are a few potential drawbacks to be aware of. Applying too much mulch, especially around the base of trees and shrubs, can trap moisture and lead to rot, diseases, or pest problems. The [University of New Hampshire Extension](https://extension.unh.edu/blog/2019/04/risks-overmulching-plants) recommends leaving a few inches of space around the trunk or stem when mulching. Additionally, organic mulches that are too thick or piled up against buildings can create a hospitable environment for termites or other pests. It’s also important to ensure that mulch is completely composted before using it around edible plants to avoid potential contamination.