By Kat Harrold
Photo by ~ Jorg Breuning
Despite issues of limited growing media depth and access an extensive green roof still offers a lot of potential for creating biodiversity. The shallow system is capable of supporting a variety of drought tolerant herbaceous plants, succulents and grasses providing food and shelter year round. Many insects and birds have found their way onto this type of green roof orchestrating ecological webs and food chains. The limited accessibility of the green roof to terrestrial animals also offers sanctuary to ground nesting birds.