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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.

Generally, you should prune around 20% of an apple tree’s growth—and never more than 30%. This means that if you have a severely overgrown tree, it can take a few seasons to prune it back enough to produce the healthiest fruit. 

If you’re dealing with a newly planted or juvenile tree, hold off on pruning beyond the initial shaping. Wait at least a couple of seasons into fruit production since pruning can increase the number of water sprouts and unproductive foliage.

A tree can split because of high winds, a change in temperature, or from an infestation or tree disease. All of these factors can overlap, making a single cause difficult to pinpoint. While winter storms are some of the most common causes for a tree to split, it can also happen because of termites or rot.

Generally, you do not have the right to take fruit from a neighbor's tree, even if the branches overhang your property. The fruit is considered the property of the tree's owner. While you may have the right to trim branches that cross into your yard, the fruit on them typically still belongs to your neighbor. However, laws can vary by state and municipality. In some areas, branches that extend into your yard or trees that straddle a property line may entitle you to some of the fruit. The best course of action is to speak with your neighbor, as they may be happy to share. If a conversation is not possible, check your local regulations before picking any fruit.