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Yes, it’s okay to trim low branches on a tree, also known as limbing up or raising the crown. Essentially, you’ll trim the lower third of the tree (trunk) and leave the upper two-thirds of the tree (crown). Arborists recommend trimming 20% of a tree’s leaves per season for two to three seasons. Trimming low branches allows light to flow through the tree, increasing circulation and making the tree stronger and healthier.

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.

There are two types of arborists: certified and consulting. A certified arborist is licensed and equipped to provide tree pruning, planting, fertilizing, monitoring, transplanting, treatment, and removal services. A consulting arborist specializes in tree appraisals, diagnosing problems and recommending treatments for illnesses. However, they will not provide these services themselves. Most consulting arborists are certified arborists who can refer you to a tree service that can administer the correct treatments.

Since overwatering can harm mature trees just as much as a lack of water, it’s important to know the signs of an overwatered tree. If your tree’s leaves are yellowing, wilting, or dropping leaves, it’s likely that you’re overwatering. Other common signs include rotting, fungi, soggy soil, soft or peeling bark, falling leaves, and brittle roots. 

If you realize that you’ve been overwatering your mature tree, stop watering and give the soil time to dry out. Then moving forward, increase time between watering sessions.