Congratulations on your new-found freedom, Werner! The window in my study at home is tiny (about 600x400 - that's about 24"x18" for you ole time Americans!) Until earlier this year it looked out onto a stone wall arcing away from the house corner where the study is sited, largely overgrown on its 1m height with scraggy trees and bushes. We cleared some of these to get more light, and replaced them with low shrubs - not sure yet if they were well enough established to survive the current cold weather. In the border between the house and this wall is a patch where daffodils, primroses and a few snowdrops will sprout in the next few months.