The reason for doing this was simply that it was difficult to locate gardening information that was specific to using window boxes. There are some great sites out there that give lots of information on growing in different conditions or how to look after specific plants and all of that is incredibly valuable. But the context and special requirements for using specific plants or solving certain problems when they’re stuck in plastic containers some distance off the ground on a windy (or not so windy) ledge was missing.
After a few months of trial and error it became apparent that local conditions could make such a difference to plant growth, to the point that plants that flourished in one box failed miserably in the next, that it seemed like a good idea to share a little bit of that knowledge with others so that they might help avoid the same mistakes. Ok, avoiding mistakes is asking too much, but at least they might have more understanding of what went wrong.
So the hope is that by sharing this experience of trying to grow plants at a northern latitude and in mixed conditions maybe some other will have a go themselves and perhaps be willing to share their experiences as well. And at least one set of window ledges will be a bit more interesting.