Local Arborist Rob Kraker says, "Trees are Time." If you don't take care of the trees you have now, it'll take YEARS to grow a new one. Better to learn how to care for your trees, and when to call an expert. He says many certified, licensed arborists will give you a free inspection and tell you what your trees need, and an estimate to get everything healthy. 
In this podcast Rob also talks about pest control and tree problems common to Nashville, and mentions a common practice that a true certified arborist will NOT do to trees.  

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