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Pruning can impact cold hardiness—but it’s less about the exact temperature and more about temperature variation. Generally, you don’t want to prune trees when there’s a risk of temperatures suddenly dropping from 50 to 60 degrees Fahrenheit to 0 degrees Fahrenheit or below. A tree is most sensitive until 48 hours after it’s pruned.

If tree branches cross well into your property line, in many cases, these branches become part of your property, and you can trim them up until your neighbor’s property line. However, this issue will vary based on local ordinances, so you should do your research before making any decisions. Better yet, speak with your neighbor about how to handle any tree issues. 

If you don’t mind the branches, you can leave them be, but if they’re becoming a hazard, it’s definitely worth having a conversation.

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.

In the case that a tree is growing directly on your property line, the cost of maintaining the tree is shared and is the property of both owners in common. In this case, all decisions regarding the maintenance of the tree must be made jointly, and both parties must agree on a course of action. You will need to agree with your neighbor about the cutting of any roots before you carry it out, and your neighbor must also consult with you before doing any trimming. Coming to an agreement with your neighbor about any shared trees ahead of necessary trimming and maintenance will make this process much simpler.