(a) The following are exempt from licensing under this chapter:
(1) The practice of landscape architecture by any person who acts under the supervision of a licensed landscape architect or by an employee of a person lawfully engaged in the practice of landscape architecture and who, in either event, does not assume responsible charge of design or supervision;
(2) The practice of landscape architecture by employees of the United States Government while engaged in the practice of landscape architecture within this state on behalf of the United States Government;
(3) The practice of landscape architecture by employees of the state or a municipal government while providing services for the governmental employer's facilities;
(4) The practice of planning as customarily done by regional and urban planners;
(5) The practice of arborists, foresters, gardeners, nurserymen, landscape contractors, home builders, floriculturists, ornamental horticulturists, landscape designers, irrigation designers, and irrigation contractors performing their respective trades or professions; and
(6) The practice of architecture or engineering as defined by the laws of this state.
(b) None of the persons referred to in subsection (a) of this section shall use the title of landscape architect without complying with the provisions of this chapter.