Object to the policy because it is badly worded and shows a lack of understanding of the subject matter. The policy needs to go back to referring to residential curtilage. A garden is defined in the Oxford Dictionary as an area of land to grow fruit and vegetables. That in planning terms is defined as agriculture and thus there is no change of use of the land unless the boundary between the residential curtilage and the plot is removed. A residential curtilage is not, as your policy wording suggests, necessarily used as a garden but often is used solely as an extension to a dwelling with all the attendant domestic paraphernalia, which has no place in the open countryside.

The replacement of the words 'residential garden' with the words 'residential curtilage' would overcome the objection.