Green roof substrates are the foundation of successful living roofs, yet they are often misunderstood. This article explores how evolving guidelines, industry-led innovations, and ongoing research are reshaping green roof growing media, revealing why substrate choice is critical to plant performance, long-term durability, and the future expansion of green roofs in diverse urban climates.

Will's Garden at Carle Foundation Hospital is a therapeutic rooftop garden, offering a tranquil space for healing. Utilizing innovative lightweight growth media, it supports native plants, stormwater management, and provides year-round beauty for patients and staff.