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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’ll want to prune back the trunk by 1 to 2 feet each year to promote bushy growth. Doing so concentrates vegetative buds closer to the bottom of the tree, where you can easily harvest fruit. For side shoots that are a year old, leave at least six leaves. 

Never remove more than 30% of a tree’s foliage during pruning—even if your tree is really overgrown. Removing this much foliage at a time could kill your tree.

The exact answer to this question depends on which region of the country you’re talking about, but according to various tree counts, some of the most common types of trees in the United States include red maple, Douglas fir, quaking aspen, loblolly pine, and sweetgum.

Common signs that a tree is rotting include dead branches, a leaning trunk, peeling or cracked bark, leaf discoloration, and the presence of fungi. If you notice any of these signs, it’s best to hire an arborist near you to inspect your tree and determine if it can be saved or if it needs to come down.