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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.

It depends on where you live—but in most areas, leaves begin falling in September and continue falling until January or February. Warmer regions, such as Southern states, may see leaves fall a bit later in the calendar year. It also depends on the type of trees in your yard and their maturity. 

Trees naturally want to grow upward, so one may straighten all by itself, though this only comes into play when a tree is leaning just a small amount. For trees growing into an awkward position or those leaning heavily in one direction, the above steps are necessary to ensure the tree gets back on the right path. This also holds true for trees planted in a spot with unstable soil.

The average lifespan of an oak tree is 100 to 300 years, so long as it isn’t impacted by diseases like sudden oak death. Some species will last shorter or longer, depending on where you live.