<human>:  How do you prune a shrub?
<bot>: Prune a shrub by trimming off the outermost layer of branches and stems. This can be done with pruning shears, loppers, or a saw depending on the size and thickness of the branches. Be sure to make clean cuts and avoid damaging the underlying bark. Make sure to leave enough of the branch or stem for new growth. When pruning, it is also important to make sure that the shrub does not become over pruned, which can reduce the health or shape of the shrub.