Mo. Rev. Stat. § 327.603
No person shall use the name or title landscape architect, landscape architecture, landscape architectural, or L.A. in this state unless he is registered as required by sections 327.600 to 327.635 provided, however, that nothing in sections 327.600 to 327.635 shall be construed as limiting or preventing the practice of a person's profession or restricting a person from providing landscape architectural services so long as such person does not hold himself out to the public by title as being registered under sections 327.600 to 327.635.
(L. 1989 H.B. 190, et al. § 2)