If you don’t cut down a dead, dying, or diseased tree, it can become a nesting place for pests like mosquitos, bees, beetles, wasps, fly larvae, and more. Some pests will live in the tree, while others will feed off the decaying wood. Unhealthy trees are also more likely to fall over, potentially injuring people and causing damage to your property.

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.

For trimming trees, your best tool is a pair of pruning shears or loppers. Both options work best for branches that are under 3 inches in diameter. Trimming trees with a larger diameter may require a robust tool like a small chainsaw or a handsaw, so take into account your tree’s diameter when deciding between tools.