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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.

In some states and municipalities, you will need a permit to remove a tree on your property. In many cases where permits are required, a tree must reach a maximum height before a permit is required to remove it. You can either ask your local building department or a tree removal professional if you’ll need a permit. If you do, you can expect to pay between $50 and $150 for the permit alone. Your tree removal company should pull the permit for you and include the permit fee in your total.

There are a few instances in which removing a tree is the best option. You might do this if the tree looks to be a major danger—potentially falling onto your home, your car, or other parts of your property—or it’s diseased beyond repair. A tree that is growing too close to your house might need to be removed to prevent mold growth.

Deciduous shade trees (the type of trees whose leaves fall off in autumn) need to be pruned in late winter—between February and March. That’s because it’s easier to find and remove sick or dead branches when no leaves are present. And wounds close and heal faster in colder temperatures so pruning them at this time also makes them less prone to infection.