(1) The practice of landscape architecture by any person who acts under the supervision of a registered landscape architect or by an employe 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 not exceeding thirty days in the aggregate in one calendar year by a nonresident not having a place of business in this Commonwealth if the person is legally qualified to engage in the practice of landscape architecture in the state or territory of his residence if the standards of the state or territory are at least equal to the standards of this Commonwealth;

(3) The practice of architecture by a duly registered architect and the doing of landscape architectural service as is incidental to his architectural services;

(4) The practice of engineering or land surveying by a duly registered professional engineer or land surveyor and the doing of such landscape architectural service as is incidental to his engineering or land surveying services;

(5) The practice of landscape architecture by officers and employes of the United States Government, so long as the services are rendered within the scope of government employment;

(6) The practice of planning as customarily done by community and regional planners;

(7) The practice of any agriculturists, horticulturists, foresters, garden or land caretakers, home builders and graders, or cultivators of land;

(8) The practice of any nurseryman, landscape nurseryman, gardener or landscape gardener, general or landscape contractor as that practice pertains to planting design and its incidental items.