A study identified and verified the technical competencies needed by Tennessee high school teachers of vocational horticulture in the areas of greenhouse management and landscape design. From an initial list of competencies that was developed and refined, a survey instrument was constructed. The instrument contained 108 competencies in greenhouse management and 31 competencies in landscape design. The 35 teachers questioned responded on a five-point Likert scale for each competency. All 108 competencies in greenhouse management received mean ratings of 3.00 or higher; 45 received mean ratings of 4.00 or higher. All 31 competencies in landscape design received mean ratings of 3.00 or higher; 18 received mean ratings of 4.00 or higher. It was recommended that the competencies be incorporated into agricultural education and horticulture programs at Tennessee Technological University. Findings should be used in design and development of inservice teacher training programs. Techniques should be developed to measure undergraduate student performance of the competencies. (Two tables list the competencies and their mean scores. The survey instrument is appended.) (YLB)