Growing mediums for green roofs are as diverse as the species of vegetation being installed. Sedum (stone crop) is famous for growing in locations with no soil present, hence the name. Sedum will actually leave a nutrient rich environment and migrate to a less desirable medium such as rock or concrete. A desirable soil mix will be lightweight, allow rapid drainage of excess moisture and contain a minimal amount of organic matter.
Building Logics provides growing mediums formulated to maximize the propagation of your desired vegetation. While standard mixes are available, custom blended mixes can be designed to accommodate each planting scheme and geographical location.