This 9-week non-credit online course, to be administrated through University of Arizona Outreach College (UAOC), will offer students foundational information on the major greenhouse environmental factors affecting plant growth and development. The contents are equivalent to an upper college level course. Students will understand interactions between plants and their microenvironments, including light penetration and CO2/H2O diffusion. Students will learn energy and mass balance of leaves and canopy and correlate these phenomena with plant productivity and related plant physiological mechanisms. Students will learn key micrometeorological principles. Lectures cover controlled environment technologies and practices of plant production in greenhouses and high tunnels. The course will be offered again during April 15th – June 15th, 2013. The enrollment must be complete by April 8th.