As preparations ramp up for the 2025 World Exposition in Osaka in Japan, the symbolic giant wooden roof, known as the "Grand Ring," was visible in its full circular form at the venue on ...
These need 10-20cm (4-8in) depth of growing medium, enough to support perennials but not shrubs and trees. They can be created, for example, on a gently sloping shed roof by building a grid of wooden ...