Garens may or may not require a lot of space: The Imperial Palace in Tokio has a real estate value similar to that of the sum of half land plots in California; while in the other hand little, natural gardens emerge even between branches in the canopy of forests and rainforests. Visiting some of such places might bring to you some ideas regarding what you can do with all the large or little space that you have availiable.
Tropical rainforests are excellent idea generators for gardeners. We as explorers, really love to see those jungle gardens! We would like to build our homes there but we have found so many different places over time that it would be ver, very difficult to decide where to stay in the end.
The Valdivian forests of Patagonia or others that are somewhat similar, like those found in Oregon, United States, might also put the gardener's mind to work. In Patagonia it is possible to find trees that are more than three thousand years old; to get to see those trees, however, takes the skill of an explorer because they are not, of course, near town or cities. There are very few trails and charts, and even fewer people who know how to find most of them, but there will always be ready individuals, waiting to go where nothers wouldn't dare.