In this study the Delphi technique has been used to develop a list of educational competencies for preparing secondary agricultural education instructors to effectively manage their school greenhouse facilities. The use of specialized facilities in agricultural education requires appropriate preparation of agricultural education teachers. The Delphi technique uses an anonymous panel of experts for suggestions and assessments aiming at consensus. Thirteen experts from multiple schools and universities took part in the investigation. The study used a series of three web-based questionnaires to determine competencies that teachers need to know, to be able to perform, and to identify effective teaching methods for teachers to obtain these competencies. The first round instrument consisted of three open-ended questions, and a series of questions to validate the background of the members of the panel. In the second round, respondents were asked to rate each competency and teaching method using a seven-point Likert-type scale. Median scores and interquartile values were calculated. Panel members were sent a copy of their individual responses as well as the group responses for review. In the third round, panel members were requested to indicate their level of agreement with each item using a five-point Likert-type scale. (Contains 3 tables.)