“Whilst building low cost small green roofs Tim Green had a brain wave. His roofs could not only keep his buildings weather proof, he could also make them into wildlife habitats and dust them with symbiotic mycorrhizal fungi to make them more drought tolerant. Genius! …The construction took about 3 hours and cost just under £15 all in [for a small woodshed roof].”
Read the full article at the source: Permaculture