Iowa Code § 468.347: Trees outside of highways.

When the roots of trees and hedges growing outside a highway obstruct the ditches or tile drains of any highway, the board of supervisors may acquire the right to destroy such trees in the manner provided for taking private property for public use. Ornamental trees adjacent to any dwelling, orchard trees and trees used as windbreaks for a dwelling house, outbuildings, barn or feedlots, shall be exempt from the provisions of this section.