The back garden whether it is your childhood house or not is often about the past. However, in dreams about your health the back garden is also about your colon or elimination system. For example, to dream of soggy newspapers in the back garden indicates mold is growing in your colon – often indicative of candida albicans.
A back garden path is always about your colon or elimination system. If it is a cement path the dream is saying that food is caked onto the walls of your colon and you need to do something to eliminate it.