“At the 2002 Philadelphia Flower Show, Temple University Ambler Landscape Architecture and Horticulture students provided the inspiration for the current green roof research taking place at the Ambler campus. Three years later, Temple University Ambler unveiled a working green roof atop the new Intercollegiate Athletics Field House, built with the assistance of a $50,000 grant from PECO, an Exelon Company.”Extensive green roof systems generally have planting media depths of less than one foot that support low-growing plants with a shallow root base. The PECO Green Roof supports colonies of carefully selected plants, all native to the region, in approximately six inches of a lightweight medium,” (Temple University).