Vegetative roof systems or green roofs are also known as living roofs. As the name suggests, vegetative roofs are a design in which plants are used to create a green space on top of a building.
Typical green roofs consist of multiple layers, including a durable waterproof foundation, a root management system, drainage layers, and some type of growing medium. While some people choose to grow vegetation in large containers on top of roofs, true green roofs are those that are physically part of the roofing system.