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If an arborist is certified by the International Society of Arboriculture (ISA), the highest level of certification available is ISA Board Certified Master Arborist. According to the ISA, this credential is reserved for arborists “who have reached the pinnacle of their profession.” Check your arborist’s credentials before hiring to confirm their level of training and expertise.

Licensing requirements for arborists, also known as tree surgeons, vary by state and municipality. Many areas require a license, which often involves specialized education and experience. Even if not mandated, it's wise to hire a licensed professional as they tend to have more experience. Beyond licensing, look for certifications from organizations like the International Society of Arboriculture (ISA) or the Tree Care Industry Association (TCIA), as this indicates a higher level of expertise. Certified arborists must typically pass a comprehensive exam. Always confirm that the arborist has a business license and is fully insured to protect yourself from liability. Seeking positive recommendations from local homeowners is also a good step in finding a qualified professional.

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, if your neighbor’s tree hangs over your yard, you can legally trim overhanging branches. Keep in mind that you cannot cross your property line to cut the trees, and if you damage the tree by trimming it, your neighbor could sue you. Depending on the type of tree and value, this could mean dishing out two to three times the value of the tree.

It’s worth noting that the specifics of this type of tree maintenance and the guidelines around it may vary by location. Do your research and, most importantly, consult with your neighbor.