Dalkeith GrovreContemporary, London
What Houzz contributors are saying:
What are the main types of extensive roof?The two most common green roofs are sedum and wildflower. Sedum roofsSedum is a perennial with succulent leaves, fleshy stems and clusters of star-shaped flowers. It’s perfect for extensive green roofs as it provides lush coverage and needs very little soil. It’s very hardy, too, shrugging off cold and heat alike, although extremes can damage it. It changes colour with the seasons, with many species turning red in late autumn. ‘Our sedum roofs include 10 to 12 species, so you get different-coloured flowers at different times of the year – red, green, yellow and white,’ says John Brennan of JB Landscapes.Sedum roofs are also lightweight, as the substrate is only around 80mm – ‘the minimum depth for happy plants,’ says John – which also means weeds find it hard to take hold, especially as the vegetation is tightly packed.