Answer: Pruning encourages new growth so trimming shrubs will help renew them and keep them lush and full. A shrub trimmer is just fine to use, but I would encourage your son to trim the entire shrub, not just the top. This way the new growth will emerge from all the branches of the shrub and maintain a compact and healthy growth pattern. As long as you don't remove more than one-third of the live material on the shrub, electric trimmers are just fine to use. Best wishes with your shrubs.
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