We have a green roof on our shed. So, we're always interested in seeing what can survive up on a roof.
The planting was dense but everything worked together beautifully.
The walls also contained a wide variety of different insect habitats, including old books (as paper pulp is useful for some insects, such as wasps, to build nests). I would never have thought of recycling old books this way, but will definitely try it for the bug hotel I'm building on the allotment.
William Robinson. Robinson popularised the use of perennials and nature conservation in gardens through such books as The Wild Garden (1870).
The design was also influenced by the craftsmanship of the Arts and Crafts movement.