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You should not trim an oak tree in the summer. Oak trees are especially susceptible to disease, and open tree wounds are an invitation for beetles that carry tree-killing fungus. If there’s no risk that the oak tree will do damage to your property or hurt someone, it’s best to save the trimming for fall or winter. If you can, seal the wound with latex to prevent fungus from getting inside.

Pruning can impact cold hardiness—but it’s less about the exact temperature and more about temperature variation. Generally, you don’t want to prune trees when there’s a risk of temperatures suddenly dropping from 50 to 60 degrees Fahrenheit to 0 degrees Fahrenheit or below. A tree is most sensitive until 48 hours after it’s pruned.

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.

Not all leaning trees are dangerous, but they can be a hazard as gravity may eventually cause them to fall. A key factor is whether the lean is new or has been present for a long time. Trees that have grown with a lean for years are not typically an immediate danger, but a sudden lean is a cause for concern as it often indicates weakening roots. If a tree is leaning more than 15% from vertical, you should consider having it straightened or transplanted. To be safe, it's always best to hire a professional arborist to inspect any leaning tree to assess the risk and avoid potential accidents.