Container gardens are just that — a garden grown in a container. The value is in their flexibility. 

They may be installed anywhere — up stairs, on a veranda, at the kitchen door where it is convenient to grow herbs, as sentinels to announce a front door, hanging from the rafters of a stoep, in a huge garden or a home where there isn't one at all, at business entrances or in a shady spot where nothing else will grow ... ..