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The City trims trees for more reasons than you may think:
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After being trimmed, a tree might look rather bare. Trees are typically trimmed high to provide for public safety. Don't worry, it will begin to look normal during the next growing season with a healthier and more attractive form and structure.
The Boulevard Tree Trimming page shows the appropriate tree clearance over streets and sidewalks.
Summer months and late winter or dormant season is the "best" time to prune.
During the late winter months (February and March), harmful pathogens are at a minimum, mostly inactive; therefore, this is a safe pruning environment from that standpoint. During this season, deciduous trees have hardened off and when the growing season begins the wounds will be sealed and the callusing process will begin.