Tex. Occ. Code § 1052.005
(a) This chapter does not apply to a person:
(2) who is a landscape architect licensed or registered in another state or country who:
(b) A person described by Subsection (a) who agrees to perform or represents that the person is able to perform a professional service involved in the practice of landscape architecture may perform a landscape architectural service in this state only if, in performing the service, the person:
Added by Acts 2003, 78th Leg., ch. 331, Sec. 4.01, eff. Sept. 1, 2003.