Philosophy is the same whether you have a small room or a small garden or balcony . To save space missing … width and length should take advantage of every inch … height.
Climbing plants and flowers where space is available , small woods pergolas … would also add ” green ” , ” shelves ” and all kinds of structures that can touch on the wall or hang as many pots – planters that if you were place them with conventionally way you would close across the available free space.