An Octagonal greenhouse can make a real centrepiece in your garden. The stylish shape can fit ideally in a corner of your garden. Critics would say that they are not an efficient use of space for a greenhouse, however when you think about a standard greenhouse with about 1/3rd of the space being a path, the octagonal design seems a lot more efficient. Many models have a full set of staging or the option of one. Add a high level shelf, and you can create an efficient growing machine!