Mo. Rev. Stat. § 327.629
No person shall practice as a professional landscape architect in Missouri as defined in section 327.600 unless and until the board has issued to him or her a license or certificate of authority certifying that he or she has been duly licensed as a professional landscape architect in Missouri, and unless such licensure has been renewed as provided in section 327.621; provided, however, that nothing in sections 327.600 to 327.635 shall be construed to require licensing of a person or corporation who is offering, but not performing or rendering, landscape architectural services if the person or corporation is licensed to practice landscape architecture in the state or country of residence or principal place of business. No person shall hold themselves out to be a professional landscape architect unless licensed pursuant to the provisions of sections 327.600 to 327.635.
§ 327.629, RSMo