This learning guide is designed to assist vocational agriculture students in mastering 20 tasks involved in the operation and maintenance of a greenhouse. Addressed in the individual sections of the guide are the following topics: identification of greenhouse designs, greenhouse construction, basic greenhouse maintenance to conserve energy, replacement of broken glass, application of shading compounds and glass lap sealants, techniques for cleaning greenhouse glass, construction and operation of a cold frame, greenhouse ventilation systems, cooling and fan ventilation systems, evaporative cooling systems, boiler heating systems and unit heaters, variation of light intensity, installation of shade cloth and black cloth for reduction of light intensity and photoperiod control, provision of light for photoperiod control, and intermittent mist systems. Each section includes the following: a task title, objectives, suggested references, a list of materials needed, procedures, review questions, and an evaluation measure. (MN)