Double wall raised bed?
I have a small front NW facing garden in which I am thinking of having a small 4 metre long wall on our boundary. As we are retired and our joints are retiring too, I wondered about making a double wall with soil between the two sections of wall, and plant bulbs and trailing plants like aubretia, making a raised bed that would save kneeling and be easy to maintain.
What are the optimum and the minimum widths I would need between the two sections of wall? What would be the best compost mix and any suggestions for flowers that ‘look after themselves’. Any other advice that might help would be appreciated.