Description Sky Garden wildflower blanket roof systems are a perfect way to bring biodiversity and colour to your building project. Our wildflower blankets are matured over a 6 month growing period and arrive to you lush and healthy, providing a beautiful wildflower look to your green roof. Our wildflower blanket packs include: Protection fleece (2mm), to provide that added protection to your waterproofing membrane. Rigid moisture retention and drainage board (20mm) with bonded filter fleece. This regulates the moisture content within the substrate layer. Biodiverse substrate (100mm). This provides a root zone for long and sustainable plant growth. Wildflower blanket (40mm) with 38 species, giving your roof a rich and diverse roof with flowering plants throughout the growing season. A saturated wildflower blanket green roof system weighs 180kg/m² and the approximate height is 160mm.