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Generally, avoid trimming trees in the summer (with the exception of pruning fruit trees as needed). Trees use a lot of energy in the summer, most of which is relegated to new growth. If you chop it too early, you could stunt the next season's growth. Again, when in doubt, do some research based on the specific tree type.

You can trim just one side of the tree, especially when that side is growing near something like a power line or a home. Pros will carefully trim the tree back until it is safe from that structure. While this is common, it also needs to be done with the utmost care, as pruning or trimming away at one side of the tree may make it structurally unsound. This instance is yet another where hiring a pro is wise, especially if power lines are involved.

In most cases, you should not use a pruning seal on trees after trimming. Applying a sealant can interfere with the tree's natural healing process, and it does not guarantee protection from pathogens. Instead of sealing the cut, the best practice is to support the tree's natural recovery by providing it with plenty of water and a dormant-style fertilizer. However, there are exceptions. Pruning seals may be recommended for very vulnerable species, like elm trees, in areas where dangerous diseases such as Dutch elm disease are prevalent. In these specific situations, the protection offered by a sealant can outweigh its downsides. For advice tailored to your situation, especially after cutting large branches, it is best to consult a local tree trimming professional.

Though summer is not ideal, you can do some light pruning during this time of year. Just make sure it’s not excessive. Vigorous pruning will stress the tree and impact next year’s growth. Generally, August to September are the best summer-pruning months, particularly for fruit trees.