Nature and architecture have never been more intertwined. As the built environment absorbs more of the earth's surface, architects are increasingly prepared for the task of integrating flora and vegetation into their creations. There are many ways of expressing this: green roofs, living walls, interior patios and entire facades full of plants . But when these are posed as solutions, there are still more questions. How does a skyscrapers the weight of hundreds of trees? How do residents keep moss covered walls alive? Evergreen Architecture explore this and much more.