
Quoting
Lane v Curry, 92 S.W.3d 355 (2002)
Accordingly, we hold that encroaching trees and plants are not nuisances merely because they cast shade, drop leaves, flowers, or fruit, or just because they happen to encroach upon adjoining property either above or below the ground. However, encroaching trees and plants may be regarded as a nuisance when they cause actual harm or pose an imminent danger of actual harm to adjoining property. If so, the owner of the tree or plant may be held responsible for harm caused by it, and may also be required to cut back the encroaching branches or roots, assuming the encroaching vegetation constitutes a nuisance. We do not, however, alter existing Tennessee law that the adjoining landowner may, at his own expense, cut away the encroaching vegetation to the property line whether or not the encroaching vegetation constitutes a nuisance or is otherwise causing harm or possible harm to the adjoining property.