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Trees should be pruned every two to five years, depending on its age and type. Young trees should be inspected and pruned every two to three years. Mature trees should be inspected and trimmed every three to five years, and fruit trees should be pruned annually with a careful eye on seasonal growth. Evergreens typically don’t need pruning, unless branches or limbs are damaged, diseased, or harboring pests.

There are several signs that may indicate a tree needs to be cut down. These include visible damage to the trunk or branches, a hollow trunk, extensive storm damage, or a significant lean to one side. Other warning signs are pest infestations or the tree growing too close to a house, power lines, or other structures. It is best to hire a professional arborist to inspect the tree, as they can determine if it can be saved or if removal is necessary.

Only trim palm trees as needed, which is usually about once per year. However, don't stick to that schedule if the palm tree doesn't need it. Avoid trimming palm trees when possible. It’s best to trim palm trees only when you notice a buildup of dead fronds. That said, leave the brown fronds during the dormant season because this organic matter helps protect the tree from the cooler weather.

Whether tree roots will continue to grow after a tree has been cut down depends on the species. Some tree roots will eventually die because they can no longer get nutrients through photosynthesis. However, other species that reproduce through root sprouts can continue to grow and produce new sprouts for seven years or more. For example, the roots of elms, ficus, and willows tend to regrow aggressively, while the roots of pines, oaks, and maples will typically die. To determine if a root system is still active, look for new sprouts on the old trunk, stump, or any exposed roots.