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The depth of tree roots depends on the species. Trees like oaks and maples can have root systems that grow down 20 feet or more. However, trees that grow in shallow soils will have roots that go only a few feet down. Research how your tree species grows in your climate area to estimate root depth.

The cost of professional tree trimming averages $460, with a typical range between $200 and $760. However, prices can be as low as $75 or as high as $1,800 depending on several factors. The size and type of the tree are major cost drivers; for example, trimming Crepe Myrtle trees costs an average of $80 to $400, while trimming giant pine trees can range from $200 to $1,800. Other factors that influence the price include the time of year, as services are often more costly in the spring. The tree's accessibility and your location also play a role, as a remote or hard-to-reach tree may increase the cost. Some professionals may offer a discount if you have multiple trees to trim.

It’s not always easy to tell when a tree is dying, although signs like dropping branches and brittle bark can sometimes offer clues. It can also be difficult to know whether a tree is dead or dormant, especially if it’s a deciduous tree. You’ll want to wait until a growth season to get a good idea of a tree’s health. When in doubt, contact an arborist for a consultation.

You should prune ornamental trees once every other year after the fruit has matured and begun to drop. You should also prune out dead branches whenever you see them. Pruning too often can stimulate more growth, especially in faster growing varieties like Bradford pears.